Like his compatriot Albert Lutuli, the Anglican cleric Desmond Tutu was regarded with the nobel peace Prize for his resistance to South Africa's fierce politically-sanctioned racial segregation system.
What was concealed accomplishments ?Tutu was recognized by the Nobel Panel for his reasonable perspectives and his valiant position, qualities which had made him a binding together image for all African political dissidents. The nonviolent means of liberation received yet more attention.
Tutu remained true to his nonviolent stance despite the heinous crimes against the black population, such as the Sharpeville massacre in 1961 and the Soweto uprising in 1976. However, he would not hold Nelson Mandela or his supporters accountable for making a different decision. The Peace Prize made a significant impact on Tutu's international standing and assisted in the fight against apartheid.
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Base your answers to questions 1 through 4 on the passage and cross section below and on your knowledge of Earth science. The cross section represents a generalized region of the Pacific Ocean along the equator during normal (non-El Niño) conditions. The relative temperatures of the ocean water and the prevailing wind direction are indicated.
El Niño Under normal Pacific Ocean conditions, strong winds blow from east to west along the equator. Surface ocean water piles up on the western part of the Pacific due to these winds. This allows deeper, colder ocean water on the eastern rim of the Pacific to be pulled up (upwelling) to replace the warmer surface water that was pushed westward. During an El Niño event, these westward-blowing winds get weaker. As a result, warmer water does not get pushed westward as much, and colder water in the east is not pulled toward the surface. This creates warmer surface ocean water temperatures in the east, allowing the thunderstorms that normally occur at the equator in the western Pacific to move eastward. A strong El Niño is often associated with wet winters along the northwestern coast of South America and in the southeastern United States, and drier weather patterns in Southeast Asia (Indonesia) and Australia. The northeastern United States usually has warmer and drier winters in an El Niño year.
Compared to non-El Niño years, which climatic conditions exist near the equator on the western and eastern sides of the Pacific Ocean during an El Niño event?
The western Pacific is drier and the eastern Pacific is wetter
The western Pacific is wetter and the eastern Pacific is drier.
The western and the eastern Pacific are both wetter.
The western and the eastern Pacific are both drier
Compared to non-El Niño years, during an El Niño event, the climatic conditions that exist near the equator on the western and eastern sides of the Pacific Ocean are that the western Pacific is wetter and the eastern Pacific is drier.
What is El Niño?El Niño refers to a significant increase in surface sea temperature in the central and eastern tropical Pacific, which occurs every 2–7 years. It is characterized by a change in the ocean-atmosphere system in the tropical Pacific and results in a change in the global climate. The phenomenon is caused by the interaction between the atmosphere and the ocean near the equator. It has an impact on the climate worldwide by altering the atmospheric pressure and ocean currents.
According to the given options, the correct option is: The western Pacific is wetter and the eastern Pacific is drier.
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angular momentum is thought to play an important role in tornado formation because as the diameter of rotating air is reduced, the wind speeds increase as angular momentum is
The conservation of angular momentum is one of the mechanisms that can lead to a tornado's formation
Angular momentum is thought to play an important role in tornado formation because as the diameter of rotating air is reduced, the wind speeds increase as angular momentum is conserved.How is angular momentum thought to be important in the formation of a tornado?
Angular momentum is thought to be important in the formation of a tornado because as the diameter of the rotating air is decreased, the wind speeds are increased as angular momentum is conserved. This occurs when air is drawn into a thunderstorm and then forced to rotate through the vertical stretching.
The result is a rotating column of air with a very small diameter (typically only a few hundred meters).The conservation of angular momentum is a concept that states that the total amount of angular momentum in a closed system will remain constant.
This means that when the diameter of the rotating air column is decreased, the speed of the rotating air column increases in order to conserve the total angular momentum. This process is important in the formation of a tornado because it results in very high wind speeds that can cause significant damage.
The development of a tornado can be initiated by a combination of several factors such as atmospheric instability, wind shear, and moisture content. The conservation of angular momentum is one of the mechanisms that can lead to a tornado's formation.
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when we say that sediment lithifies, we mean that it ______.
How old is the Pottsville formation in alabama?
answer:
295 ma
The minimum age of the metatonalite sample provides a maximum depositional age of 295 ma- (master of arts).
Two reasons that Britain needed help in the Malay states
OCEAN SURFACE CIRCULATION 1. For each wind arrow, draw an arrow showing the direction of the average water movement due to deflection. 2. The water movement in the ocean is deflected further by the continents. Draw in a single, large dashed circle with arrows showing the resulting circular surface current in the North Atlantic Ocean. 3. What is the direction of the overall water motion? clockwise counterclockwise 4. In what direction does the current you drew flow next to the East Coast of North America? toward the north foward the south 5. Does the water in the Atlantic Ocean moving to the north past the East Coast of North America come from a warmer or cooler climate than the East Coast of North America? warmer cooler 6. Two shdents are discusting the turface currents in the Pocific Ocean in the northern hemisphere Student 1t t think the surface current trovels clockwise. like f dnew to the right, becouse the whal is the same os over the Atlantic Ocean in the northem hemisphere. The cold-woter current is moving south next to the West Coost of North Amenico. Student 2i I think it trovels counterclockwise, like I drew. The Aflantic Ocean is a different ocean thon the Pacific Ocean, so the currents will trovel in different directions. The warm-water current is moving north next to the West Coost of North America. With which student do you agree? Why? 7. Ocean water at beoches in Southern California on the West Coast are much colder than beaches in South Carolina on the East Coost, even though they are located at the same latitude. Explain why, using the direction of the surface currents near each coast. 8. On the world map, draw in the large surface ocean circulation in the northern hemisphere for the Pacific and Atlantic Oceans. Check your answers with Questions 2 and 6. 9. Jopan is on the wentern side of the Pacific Ocean. Fwa students are discussing whiether they would expect ocean water temperatures in Japon to be more similar fo Southorn Colifornia or South Corolina. Student It Southem Colifomia, becouse both Japan and Southern California are in the Abcific Oceon so the same woter circulates between them. Student 2: South Carolina, becouse currents in both locafions are coming from the south, so water temperatures in both areas would be watm from tropical water. With which student do you agree? Why? 10. The Coriolis Effect causes surface currents to go counterclockwise in the southern hemisphere. On the map below draw the surface ocean currents in the southern hemisphere for the Atlantic Ocean and the Pacific Ocean. The surface ocean circulation in the northern hemisphere in these oceans has been drawn with dashed lines for you. 11. Would you expect Chile in the southern hemisphere to have ocean water temperatures more similar to Southern California or South Carolina? Explain your answer.
Answer:
c
Explanation:
After graduating, you and two of your classmates decide to embark on a sailing voyage. Being novices at long-distance sailing, you and your friends decide to tackle something that appears relatively simple. You decide that a round-trip across the Atlantic, starting in North America, would NOT be a bad idea. You decide to leave from North Carolina, where the old boat you bought is located, and travel across to England, then south from there all the way down to Morocco, then back across the Atlantic. You also decide to prepare by digging up your old ISP 203a notes and a map of ocean currents to help you out....1. How do you plan your route there and back, so that the prevailing ocean currents provide the most help? Which currents are these? Draw them and label them on the map on the last page of this handout.2. You know that currents are driven by winds. What are the two major winds that drive the currents you will use in part 1?Getting across to England is a breeze – you can’t believe how easy the trip was, and how quickly it all went by. Now you are ready to head back. You know the trip home will take longer...You are back at sea, just entering the warmer climates to the south, when disaster strikes. Off the CanaryIslands (on your map), your boat capsizes in a storm. Before she sinks, you have just enough time to grab the emergency kit and jump into the inflatable lifeboat. Whew! But...now what??? The current is flowing westward; try as you might, you can’t make the boat go east as you have no sail. So, you’re off across the Atlantic again, although not exactly as you’d planned. This WILL be educational!
The currents you will use are the Gulf Stream, the North Atlantic Drift, the Canary Current, and the North Equatorial Current. The two major winds that drive the currents you will use are west wind and east wind.
To plan your route there and back, you should take advantage of the prevailing ocean currents. The Gulf Stream is a warm and swift ocean current that moves from the Gulf of Mexico, up along the east coast of North America and across the Atlantic towards Europe.
The North Atlantic Drift is an ocean current that moves in the opposite direction of the Gulf Stream and is a weaker current. The Canary Current is a cool and weak ocean current that flows southwards from the west coast of Europe to northwest Africa. Finally, the North Equatorial Current is a warm ocean current that moves westwards across the Atlantic.
The two major winds that drive the currents you will use are the prevailing westerlies, which move from west to east, and the northeast trades, which move from northeast to southwest.
In your situation, the current is flowing westward and you can't make the boat go east as you have no sail. To get back to North Carolina, you should use the Gulf Stream to your advantage and move south-eastward along the edge of the Gulf Stream towards the North Atlantic Drift. From there, you can use the North Atlantic Drift to get across the Atlantic and back to North Carolina.
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Simple-exponential smoothing forecasting models are useful for data which have All of the options are correct. pronounced seasonality. a downward time trend. neither an upward or downward time trend. an upward time trend.
Simple-exponential smoothing forecasting models are useful for data which have C. neither an upward or downward time trend.
When should simple exponential smoothing forecasting be used ?Simple-exponential smoothing forecasting models are a type of time series forecasting technique that uses weighted averages of past observations to predict future values.
These models are best suited for data that does not exhibit a clear trend, either upward or downward. When data have a pronounced seasonality or trend, more advanced time series models may be necessary to make accurate forecasts.
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Which of the following are true of western boundary currents?
Choose all that apply.
deep, as compared to eastern boundary currents
they flow along the more gradual slope of the hill of water
wide, as compared to eastern boundary currents
weak, as compared to eastern boundary currents
fast, as compared to eastern boundary currents
Western boundary currents are deep, fast and wide as compared to eastern boundary currents.
What are western boundary currents?
Western boundary currents are swift, narrow currents that flow along the western edge of ocean basins. They move warm water from the equator toward the poles, much like the Gulf Stream. They flow along the edge of the western continental shelves and are strongly influenced by the continental topography.
Western boundary currents are deep, as compared to eastern boundary currents.Western boundary currents flow along the more gradual slope of the hill of water.Western boundary currents are wide, as compared to eastern boundary currents.Western boundary currents are fast, as compared to eastern boundary currents.
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Increased atmospheric CO2 concentration over the next 50 years is expected to cause which of the following global changes?
(A) A decrease in the severity of storms
(B) A significant loss of biodiversity in the tropics
(C) Fewer significant heat waves
(D) A delay in the spring migration of many birds
(E) Later blooming of many mountain flowers
Increased atmospheric CO2 concentration over the next 50 years is expected to cause the following climate changes.
A significant loss of biodiversity in the tropicsA delay in the spring migration of many birdsLater blooming of many mountain flowersThe correct options are B, D, and E.
Climate change, which is exacerbated by elevated CO2 levels, can have a negative impact on biodiversity, especially in tropical areas. A loss of biodiversity and species extinctions may result from habitat destruction, changes in temperature and precipitation patterns, and other factors.
Thus, the ideal selections are options B, D, and E.
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The country of ____ is a volcanic plateau built of basaltic lava erupted from a hot spot underlying the Mid-Atlantic Ridge in the North Atlantic Ocean.
The country of Iceland is a volcanic plateau built of basaltic lava erupted from a hot spot underlying the Mid-Atlantic Ridge in the North Atlantic Ocean.
The country that fits this description is Iceland. Iceland is located in the North Atlantic Ocean and is situated over a volcanic plateau built of basaltic lava erupted from a hot spot underlying the Mid-Atlantic Ridge. This volcanic activity is responsible for the creation of Iceland's unique landscapes, which include geysers, hot springs, and glaciers, among others.
The country is also known for its frequent volcanic eruptions, some of which have had significant impacts on the environment and local communities.
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b) How can remote sensing be of use in disaster management like drought and desertification? drought and desertification? (2×2)
When gas escapes quickly and violently from lava it may produce a frothy glass full of holes left by former gas bubbles; this porous material, known as pumice, contains so many holes it can float on water.
True or False?
The statement given "When gas escapes quickly and violently from lava it may produce a frothy glass full of holes left by former gas bubbles; this porous material, known as pumice," is true.
Pumice is a porous material that is created when gas escapes quickly and violently from lava, forming bubbles in the molten rock that eventually harden into a solid mass.
Pumice is a light, frothy glass that is filled with many holes that were left by former gas bubbles.
Due to the numerous holes within the material, pumice can float on water. Because of its porosity, pumice has a wide range of uses, including as a polishing abrasive and a lightweight aggregate in concrete.
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What are the boundaries between tectonic plates that are colliding?
Answer:
Convergent plate boundary
Explanation:
If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the covering plates will move beneath the other, a process known as subduction. Deep trenches are features often formed where tectonic plates are being subducted and earthquakes are common at subduction zones as well.
How are federal judges selected to serve?
Federal judges are appointed by the President and confirmed by the Senate, according to the Constitution.
Who chooses the federal judges?High Court judges, court of requests judges, and region court judges are selected by the President and affirmed by the US Senate, as expressed in the Constitution. Senators and House members from the President's political party occasionally make recommendations for potential nominees. Each nominee typically has confirmation hearings held by the Senate Judiciary Committee. These judicial officers are appointed for life under Article III of the Constitution. The nomination and confirmation processes are independent of the federal Judiciary, the Judicial Conference of the United States, and the Administrative Office of the United States Courts.
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what role does the asthenosphere play in plate tectonics
Answer: lubricating the undersides of Earth's tectonic plates and allowing them to move.
Explanation:
which one of the following measurable characteristics in volcanoes is not used to forecast volcanic eruptions question 8 options: a) volcanic earthquakes b) ground deformation c) tectonic earthquakes d) volcanic gas emissions
The correct answer to this question is option C, tectonic earthquakes. Tectonic earthquakes are caused by the movement of the earth's tectonic plates, which are separate from the movement of magma in volcanoes.
Magma movement in volcanoes can be monitored through volcanic earthquakes, ground deformation, and volcanic gas emissions.
Volcanic earthquakes occur when the magma in a volcano moves, causing a seismic event. Volcanic earthquakes are a major indicator of an impending eruption, as they occur most frequently before an eruption.
Ground deformation occurs when magma accumulates in a volcano and causes the ground around it to bulge. Ground deformation is often used to detect magma accumulation in the magma chamber, which is a major sign of an impending eruption.
Volcanic gas emissions can also be used to predict volcanic eruptions. When a volcano is building up pressure, it will start to release gas, including sulfur dioxide and carbon dioxide, before an eruption. These gas emissions can help to identify an impending eruption.
In conclusion, tectonic earthquakes are not used to forecast volcanic eruptions, as they are not caused by magma movement in volcanoes. Volcanic earthquakes, ground deformation, and volcanic gas emissions are all used to predict an upcoming volcanic eruption.
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a pyroclastic flow blank . multiple select question. is rarely responsible for volcano-related deaths can move at speeds that exceed 100 m/sec is a mixture of magma, volcanic ash and gas, and air forms when airborne pyroclasts of various sizes begin to rain down upon the ground can reach temperatures of 350o c
A pyroclastic flow is a volcanic ash and gas. the correct answer is: B
A pyroclastic flow can move at speeds that exceed 100 m/sec, is a mixture of magma, volcanic ash and gas, and air, forms when airborne pyroclasts of various sizes begin to rain down upon the ground, and can reach temperatures of 350°C.
However, it is not true that it is rarely responsible for volcano-related deaths.
This statement is incorrect.
What is a pyroclastic flow?A pyroclastic flow is a volcanic event that produces a dense, dangerous cloud of ash, lava blocks, and gas that flows swiftly down the slope of a volcano.
Pyroclastic flows are most commonly associated with volcanic eruptions and can cause a lot of damage and death.
As previously stated, a pyroclastic flow is a mixture of magma, volcanic ash and gas, and air, and it can reach temperatures of 350°C.
The statements which are true regarding the pyroclastic flow are:
It can move at speeds that exceed 100 m/secIt is a mixture of magma, volcanic ash and gas, and air forms when airborne pyroclasts of various sizes begin to rain down upon the ground and can reach temperatures of 350°C. Therefore, the correct answer is B.
It can move at speeds that exceed 100 m/sec, is a mixture of magma, volcanic ash and gas, and air, forms when airborne pyroclasts of various sizes begin to rain down upon the ground, and can reach temperatures of 350°C.
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The landslide that occurred on Mount St. Helens just prior to its eruption created a drop in _______ that allowed dissolved gas in magma and groundwater to expand very rapidly and erupt explosively.
The landslide that occurred on Mount St. Helens just prior to its eruption created a drop in pressure that allowed dissolved gas in magma and groundwater to expand very rapidly and erupt explosively.
The eruption began with a massive landslide, which caused the top of the volcano to collapse and form a huge crater. This landslide also created a sudden drop in pressure in the volcano, which allowed the gas bubbles in the magma and groundwater to expand rapidly and escape explosively.
The release of gas from the magma and groundwater led to a powerful eruption that blew out the north side of the volcano, sending a massive cloud of ash, rocks, and gas into the air. The eruption was also accompanied by a series of pyroclastic flows, which are fast-moving, superheated clouds of ash and gas that can travel long distances from the volcano.
The landslide that preceded the eruption played a critical role in the explosive nature of the eruption. Without the sudden drop in pressure caused by the landslide, the gas bubbles in the magma and groundwater might have slowly and gradually released without creating a catastrophic eruption. Instead, the landslide created a sudden release of gas that led to an explosive eruption, causing widespread destruction and loss of life in the surrounding areas.
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what geologic event is responsible for creating the gold that made prospectors rush to california in the late 1840s?
The gold rush that brought prospectors to California in the late 1840s was due to a geologic event known as the California Gold Rush. This event was caused by gold deposits that were discovered in the Sierra Nevada Mountains.
These deposits were created millions of years ago when the Sierra Nevada Mountains were formed by the movement of tectonic plates. As these plates moved, they created cracks and crevices in the earth's crust. Over time, the gold deposits were pushed upwards and became exposed to the surface.
As news of these gold deposits spread, prospectors rushed to California in the hopes of striking it rich. The California Gold Rush changed the course of history, bringing an influx of people to the region and transforming the state into the bustling economy it is today.
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what does this ancient sedimentary rock rich in iron indicate about the conditions in which it was deposited?
This ancient sedimentary rock rich in iron indicates that the conditions in which it was deposited were likely oxygen-deprived and relatively still.
This is because iron is only able to be deposited and preserved in environments that don't contain significant amounts of oxygen, as it quickly oxidizes in the presence of oxygen.
Also, sedimentary rocks form when sediment is deposited in a relatively still environment, and iron is able to form deposits due to its high density. The environment in which the sedimentary rock was likely deposited was an anoxic (low oxygen) environment, as indicated by its high iron content.
The lack of oxygen and still environment indicates that the ancient environment where this sedimentary rock was deposited was not conducive to life.
In an anoxic environment, there is little to no oxygen to support aerobic organisms, and the still environment would have prevented circulation and the transport of nutrients, making it even less hospitable for life.
The fact that this sedimentary rock contains high levels of iron is a clear indication of the conditions in which it was deposited. This sedimentary rock was likely deposited in an oxygen-deprived and relatively still environment, making it hostile to life.
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How does climate change affect albedo?
Earth's albedo decreases as the amount of snow and ice covering the surface decreases as a result of melting caused by rising global temperatures.
What factor that affects climate is albedo?The ability to reflect sunlight into space is known as albedo. Sunlight is reflected by deserts, clouds, ice and snow, and aerosols (particles in the air). The more solar energy that is reflected, the higher the albedo; the chillier The albedo is also raised as the ice cover expands as the temperature drops. The growing conditions for alpine grasslands on the TP, where temperature is the primary constraining factor, are improved by increased vegetation coverage, which results in a lower surface albedo and more energy absorbed (Bonan et al. 1992, Betts 2000, Barnes and Roy 2008).
A natural greenhouse effect is the cause of the warm global climate on Earth. Earth's surface is heated by the majority of the Sun's light as it passes through the atmosphere. Infrared radiation is released by the warmed oceans and land. Heat-trapping gases in the atmosphere of Earth absorb some of the infrared radiation.
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Then, for each of the scientists listed on the site, describe how their ideas caused the original theory to evolve into what we know today.
Harry Hammond Hess
Frederick Vine and Drummond Matthews
John Tuzo-Wilson
Dan McKenzie
Harry Hammond Hess:
Harry Hammond Hess was a geologist and naval officer who proposed the seafloor spreading theory in the 1960s. He argued that new oceanic crust was created at mid-ocean ridges as magma rose from the mantle and pushed the existing crust away.
This theory revolutionized the understanding of Earth's crust and became a cornerstone of plate tectonic theory.
Frederick Vine and Drummond Matthews:
In the late 1960s, Frederick Vine and Drummond Matthews proposed the magnetic stripe reversals on the seafloor. They discovered that the magnetic stripes on the seafloor alternated in polarity and that the age of the seafloor increased with its distance from the mid-ocean ridge.
This observation showed that the seafloor was spreading from the mid-ocean ridges and validated the theories of seafloor spreading proposed by Hess.
John Tuzo-
Wilson: In the early 1960s, John Tuzo-Wilson proposed that two plates could move apart and diverge from one another. He argued that this could explain the formation of many geological features such as rift valleys, islands, and trenches. His theory further strengthened the concept of seafloor spreading and the idea of plate tectonics.
Dan McKenzie:
Dan McKenzie proposed the concept of spreading rates in the 1970s. He showed that the rate at which the seafloor was spreading was consistent with the rate at which plates were being created. This observation provided strong evidence for the theory of plate tectonics and helped to further refine our understanding of seafloor spreading.
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Ranking Task: Kepler's Third Law of Planetary Motion 7 of 9 Part C The foilowing dagrams are the same as those from Parts A and B. This šme, rank the planets from left to right based on their average orbital speed, from fastest to slowest. If you think that two (or more) of the diagrams should be ranked as equal, drag one on top of the other's) to show this equality. (Distances are to scale, but planet and star sizes are not.) View Available Hint(s) Reset Help Fastest Slowest
Ranking Task: Kepler's Third Law of Planetary Motion 7 of 9 Part C: Planets ranked from fastest to slowest based on their average orbital speed are as follows:
Jupiter: As it has the largest distance, it takes a longer time to orbit the sun than the others, but it travels at a much faster pace than the other planets, making it the quickest planet in the solar system.
Mars: It is positioned in the middle of the group, indicating that it is not the quickest or slowest planet, but it is still one of the speediest planets in our solar system.
Venus: It is the second planet from the sun, indicating that it is not the farthest planet from the sun. Its location in the diagram shows that it is closer to the sun than Earth, which is why it travels faster than Earth.
Earth: It is the third planet from the sun, and it is closer to the sun than Mars. As a result, it orbits the sun at a faster pace than Mars.
Saturn: Saturn is the slowest planet in the solar system. The vast distance between Saturn and the sun indicates that it is the slowest planet.
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The Weather Channel has managers meet with subordinates to give them feedback all throughout the year. Quarterly, managers meet with subordinates to discuss whether or not specific expectations were met as part of the formal system. a critical incident b comparison с compensation d performance appraisal e work standards
Answer:
Ask your teacher for more explanation
Explanation:
what is the rock cycle?group of answer choices the cycle that rocks go through when interacting with waterthe transformation of one mineral type to anotherthe transformation of one rock type to anotherthe cycle that rocks undergo when interacting with air
The rock cycle is the process through which rocks are continually changed from one form to another.
This cycle is driven by the action of Earth's tectonic and surface processes, such as erosion and weathering.
Rocks are constantly being recycled through the rock cycle, moving from one form to another and then back again.
The three main types of rocks are igneous, sedimentary, and metamorphic. Igneous rocks form when magma cools and crystallizes. Sedimentary rocks are formed from the weathering and erosion of existing rocks.
Metamorphic rocks are formed when heat and pressure cause existing rocks to change form. All three of these types of rocks can be found in the rock cycle, and they are all interrelated.
The rock cycle is not a linear process. Instead, rocks may move back and forth between different stages of the cycle, or they may undergo multiple changes before being reabsorbed into the environment.
The most common cycle starts with igneous rocks, which are then broken down into sedimentary rocks through erosion and weathering.
Metamorphic rocks are then formed when the sedimentary rocks are exposed to intense heat and pressure. Finally, the metamorphic rocks may be melted down and reabsorbed into the environment.
The rock cycle is an important process for shaping the surface of the Earth, and it is a key part of the Earth's geologic system.
Without the rock cycle, rocks would not be able to be recycled and reused in different forms, and the surface of the Earth would look very different.
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Question 1 3 pts The style of eruption depends on the plate tectonic setting in which the volcano is situated. Compare the different eruption styles you could observe at a divergent versus a convergent plate boundary. Make sure to address the roles that composition, viscosity, and gas content play in your answer.
At a divergent plate boundary, the plates are moving away from each other. This type of plate boundary is typically associated with less explosive eruptions.
Eruptions in this type of setting are usually composed of basaltic magma, which is low in silica content and very fluid.
These eruptions produce lava flows and rarely cause ash and pyroclastic flows. Since the viscosity of basaltic magma is low, gas bubbles can escape easily and cause less explosive eruptions.
At a convergent plate boundary, the plates are pushing together. This type of plate boundary is typically associated with explosive eruptions.
Eruptions in this type of setting are usually composed of andesitic or rhyolitic magma, which is high in silica content and more viscous than basaltic magma.
These eruptions produce ash and pyroclastic flows, and can be more explosive due to the higher viscosity of andesitic or rhyolitic magma.
The gas bubbles are more difficult to escape, so pressure builds up and causes more explosive eruptions.
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What is the cause of the difference in surface water salinity between equatorial and subtropical regions in the atlantic ocean?
Answer:
This is because equatorial regions also get a high volume of rain on a regular basis, which dilutes the surface water along the equator. So the higher salinities are found at subtropical, warm latitudes with high evaporation and less precipitation.
Explanation:
How does the character of a rock influence weathering?
Group of answer choices:
a) Minerals that are soluble can be dissolved and reprecipitated and so are resistant to weathering.
b) Rocks that are broken have more surface area and so weather faster.
c) Rocks that are easily weathered and eroded generally form steep cliffs.
d) Fractures and other discontinuities block the entry of water into a rock and so make the rock more resistant to weathering.
e) None of these choices are correct.
a) Minerals that are soluble can be dissolved and reprecipitated and so are resistant to weathering.
How are index minerals used to determine metamorphic grade?
a.Index minerals are specific minerals that dissolve in chemically active fluids in a certain sequence.
b. Index minerals are specific minerals that have formed only at specific times in Earth's history.
c.Index minerals are minerals that occur only in rocks showing specific foliations.
d.Index minerals are specific minerals that form only at specific geographic locations.
e.Index minerals are specific minerals that form at specific temperatures and pressures.
Index minerals used to determine metamorphic grade - Index minerals are specific minerals that form at specific temperatures and pressures. Therefore the correct option is option E.
The process of determining metamorphic grade with index minerals is known as metamorphic facies. The identification of index minerals is an essential method for determining the metamorphic grade of rocks. Index minerals' presence and abundance can indicate the grade of metamorphism undergone by a rock.
Index minerals are minerals that indicate a particular grade of metamorphism, with each mineral being formed at a distinct range of temperature and pressure.
To identify the grade of metamorphism of a rock, geologists use a system known as metamorphic facies. Metamorphic facies are a group of metamorphic mineral assemblages that share a similar mineralogy and temperature and pressure ranges. Index minerals are used to classify metamorphic facies.
Various minerals are used to represent each metamorphic facies, and these minerals are known as index minerals. Metamorphic grade is determined by the occurrence of index minerals that have formed only at specific temperatures and pressures.
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