Answer:
The correct answer is c. Source
large metallic objects that are clustered in bands called _____
Answer:
Large metallic objects that are clustered in bands are called "asteroid belts".
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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identify the conditions that are likely to help preserve animal remains, making it more likely for them to become fossils.
Answer:
The following conditions are likely to help preserve animal remains, making it more likely for them to become fossils:
Rapid burial: When an animal dies, it is important that its body is quickly buried by sediment or other materials, which can protect it from scavengers, decay, and weathering.
Low oxygen environments: In low oxygen environments, such as swamps, bogs, or deep ocean sediments, decomposition slows down, which can help preserve the animal's remains.
Hard parts: Animals with hard parts, such as bones, teeth, or shells, are more likely to be preserved as fossils than those with soft tissue because hard parts are more resistant to decay and can survive burial and fossilization processes.
Lack of disturbance: If an animal's remains are not disturbed or moved after burial, they are more likely to remain intact and undergo fossilization.
Mineral-rich water: When mineral-rich water percolates through buried remains, it can replace the organic material with minerals, preserving the structure of the original organism and creating a fossil.
It is important to note that the likelihood of an animal becoming a fossil depends on a combination of factors, and even under ideal conditions, fossilization is still a rare event.
Explanation:
Which of the following processes have contributed to the evolution of the Earth over time?
I. the motion of crustal plates
II. the rock cycle
III. radioactive dating
IV. erosion
V. deposition
Answer:
I II IV and V
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.
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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When does flooding occur?
a. When the amount of water exceeds the capacity of the land
b. When the amount of water exceeds the capacity of the rainfall
c. When the amount of water exceeds the capacity of the river's channel. The excess water overflows the river's banks and spills out across the flood plain. D. Prolonged rainfall leading to the satiation of the ground
Flooding occurs when the amount of water exceeds the capacity of the land or the rainfall. The correct option is B.
This can happen due to several reasons, such as heavy rainfall, melting snow, or a high tide. When the capacity of the river’s channel is exceeded, the excess water overflows the river’s banks and spills out across the flood plain. Prolonged rainfall can also lead to flooding, as the water will saturate the ground and begin to pool in low-lying areas.
In addition, flash floods can occur when a heavy rainstorm or thunderstorm happens in a very short period of time, making it difficult for the ground to absorb the water. In any case, when flooding occurs, it can result in significant damage to property, infrastructure, and the environment, making it important to take precautions to prevent flooding where possible. The correct option is B.
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buried erosion surfaces that represent large intervals of time are called
Buried erosion surfaces that represent large intervals of time are called unconformities.
Unconformities are geological boundaries between rock layers that indicate a gap in the geological record, often caused by erosion, non-deposition, or deformation. These gaps can represent millions of years of Earth's history, and studying them can help geologists understand past geological events and the relative ages of different rock layers. There are three main types of unconformities: angular unconformities, where younger rock layers are deposited on top of older, tilted and eroded rock layers; disconformities, where there is a gap in deposition between parallel rock layers; and nonconformities, where sedimentary rock layers rest on top of older, eroded igneous or metamorphic rock. Unconformities are important tools in understanding the geological history of the Earth.
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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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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 is the original rock that forms metamorphic rock called?
The original rock that forms metamorphic rock is called a parent rock or protolith.
What is parent rock?This can be any type of rock, such as sedimentary, igneous, or even another metamorphic rock.
The mineral composition, texture, and structure of the parent rock determine the characteristics of the resulting metamorphic rock. Through the process of metamorphism, the parent rock is transformed into a new rock with different physical and chemical properties.
Examples of common parent rocks include shale, granite, and limestone.
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What solid figure has two bases, but no lateral faces?
cone
cylinder
rectangular prism
triangular prism
Answer: Cylinder
Explanation:
Think of a cylinder. It has 2 parallel circular bases and a curved surface.
None of those are considered lateral. Therefore, your answer is a cylinder.
Overall, this type of seismic wave is the most destructive.A)P waveB)S waveC)(surface waveD)tsunami
Answer:
Surface wave
Explanation:
5. [5 pts] You're studying genotypes at a gene that you've discovered contributes to Inflammatory bowel disease (IBD). The gene has two alleles: W and v. WW homozygotes produce, on average,
2.2kids
. Wv heterozygotes also produce, on average,
2.2
kids. However, w homozygotes are more likely to have the disease, and therefore, produce, on average,
1.7
kids. What is the relative fitness of the vV genotype? show your work
The relative fitness of the vV genotype can be calculated by comparing it to the relative fitness of the WW genotype. Since WW homozygotes produce, on average, 2.2 kids, and wv heterozygotes also produce, on average, 2.2 kids, then the relative fitness of the WW genotype is 1.0.
Since w homozygotes produce, on average, 1.7 kids, then the relative fitness of the vV genotype is (1.7/2.2) = 0.77. This means that the vV genotype has a lower relative fitness than the WW genotype.
This difference in relative fitness between the WW and vV genotypes is due to the fact that w homozygotes are more likely to have the disease, which reduces their reproductive success.
This is an example of natural selection in action, as individuals with the WW genotype have a higher relative fitness than individuals with the vV genotype, and so the WW genotype is more likely to be passed on to future generations.
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which organisms were alive when new york state was last covered by a continental ice sheet?
New York State was last covered by a continental ice sheet about 12,000 years ago. The organisms that were alive when the last continental ice sheet covered New York State were the tundra animals.
These animals could survive in the cold, harsh climate and adapt to the ice sheet's rapid changes. Woolly mammoths, giant ground sloths, musk oxen, and woolly rhinoceroses are among the animals that existed during this period. Many organisms, on the other hand, were unable to survive in the harsh tundra environment and eventually went extinct.
The extinction of large mammals in North America occurred simultaneously with the last major glaciation, which occurred approximately 10,000 years ago. The harsh environmental conditions caused the migration of organisms to warmer regions, resulting in the loss of many species' biodiversity.
New York State was a barren wasteland throughout the time it was covered in ice. The last continental ice sheet in New York State gave rise to a number of unique habitats and creatures, making it an exciting time in the state's history.
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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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what land extends from central mexico to costa rica?
The land that extends from central Mexico to Costa Rica is called the Mesoamerican region.
The Mesoamerican region is a cultural and geographical area in the Americas, extending from central Mexico to Costa Rica. This region is known for its rich and diverse cultural history, including the rise and fall of ancient civilizations such as the Maya, Aztec, and Olmec.
According to archeological evidence, the Mesoamerican region is considered to be one of the six cradles of civilization in the world. This region has many natural resources, such as fertile land, forests, and minerals, which made it an attractive area for early civilizations to settle and flourish.
In summary, the land that extends from central Mexico to Costa Rica is called the Mesoamerican region. This region is known for its cultural and geographical significance and was home to ancient civilizations such as the Maya, Aztec, and Olmec.
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Mudstone and shale are not split into two rock types by some geologists. Geologists that do classify them differently do so because mudstone has more ______ than the typical shale.
Mudstone and shale are often seen as two very similar rock types and some geologists do not classify them separately. However, geologists that do classify them differently generally base their decision on the amount of clay present in each rock type.
Mudstone typically has a higher amount of clay than shale and is considered to be a more clay-rich sedimentary rock. This is because mudstone is made from very fine-grained sediment which has been compacted and hardened into a solid. In contrast, shale is made from silt and fine sand-size particles which are generally less clay-rich than mudstone.
As a result, when looking at the two rocks in thin section, mudstone is much more clay-rich and has a higher clay content than shale. This difference in clay content is what allows geologists to differentiate between mudstone and shale.
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rock that has formed from lithification of any type of sediment, including clastic or chemical sediments, or organic remainsa.weathering b. metamorphicc. lavad. igneouse.magma f.erosion g.sedimentary h. protolith
Rock that has formed from lithification of any type of sediment, including clastic or chemical sediments, or organic remains is known as sedimentary rock. Therefore the correct option is option G.
Sedimentary rocks are classified into three groups. These are: clastic, chemical, and organic sedimentary rocks. Clastic sedimentary rocks
Clastic sedimentary rocks are made up of pre-existing rock fragments that have been eroded, transported, and deposited by wind, water, or ice. Examples of clastic rocks are shale, sandstone, and conglomerate.
Chemical sedimentary rocks Chemical sedimentary rocks are formed when dissolved minerals are precipitated out of water. Examples of chemical rocks are limestone and gypsum.
Organic sedimentary rocks Organic sedimentary rocks are made up of the remains of once-living plants and animals. Examples of organic rocks are coal and chalk.
Sedimentary rocks are typically formed in layers, known as strata, and often contain fossils of ancient plants and animals.
Therefore the correct option is option G.
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Repurposing old quarries or damming fields with piles of soil are inexpensive ways of creating_________ that reduce flooding from surface runoff but do not alter stream flow.
Answer:
c
Explanation:
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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the distinctive vertical joints seen in this basalt flow most likely formed as a consequence of which of the following?
The distinctive vertical joints seen in this basalt flow most likely formed as a consequence of thermal contraction. Thermal contraction occurs when hot molten rock cools and contracts upon cooling. As the rock cools, fractures form which create the vertical joints seen in the basalt flow.
Thermal contraction is common in basalt flows and can result in a variety of joint types, depending on the rate of cooling. As the molten rock cools, it contracts and fractures, resulting in a network of vertical and horizontal fractures, which can range in size from millimeters to centimeters. As the rock cools further, these fractures can become more pronounced, resulting in distinct vertical columns of rock.
The rate of cooling of the molten rock is a major factor in determining the size and pattern of the vertical joints in the basalt flow. If the molten rock cools quickly, it contracts more rapidly and thus more fractures form, creating a more pronounced pattern of vertical joints.
Conversely, if the molten rock cools slowly, the contraction is slower and less fractures form, resulting in a less pronounced pattern of vertical joints.
The cooling of the molten rock is also affected by the type of environment it is exposed to. Basalt flows in a temperate environment will cool at a slower rate than those exposed to a colder environment, thus producing a different pattern of vertical joints.
In conclusion, the distinctive vertical joints seen in this basalt flow most likely formed as a consequence of thermal contraction. The size and pattern of the joints is affected by the rate of cooling of the molten rock, as well as the type of environment it is exposed to.
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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:
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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Which of the following factors describe the metamorphic conditions at a mid-ocean ridge? -low temperature -low pressure -hot, watery fluids.
The factors that describe the metamorphic conditions at a mid-ocean ridge are hot, watery fluids.
What are mid-ocean ridges?Mid-ocean ridges are linear underwater mountain chains that run along tectonic plate boundaries. They are found where two tectonic plates diverge or move away from each other.
Mid-ocean ridges account for about 20% of the Earth's surface area. They also have a major role in oceanic crust formation.
Metamorphic conditions at a mid-ocean Ridge
The following are the factors that describe the metamorphic conditions at a mid-ocean ridge:
Hot, watery fluids - Hot water with minerals like sodium and calcium is released through hydrothermal vents on mid-ocean ridges. This process is called hydrothermal metamorphism. These fluids react with the minerals in the surrounding rock, resulting in the formation of new minerals and rock textures.
Low pressure - Hydrothermal vents on mid-ocean ridges are under very low pressure due to the high pressure of the surrounding ocean water. The low pressure allows minerals and hot water to circulate freely, resulting in the formation of new minerals and rock textures.
Low temperature - Hydrothermal fluids in mid-ocean ridges have a lower temperature than those in continental settings. However, they are still hot enough to cause metamorphism in the surrounding rock.
Your question is incomplete but most probably your full question was:
Which of the following factors describe the metamorphic conditions at a mid-ocean ridge? Select all that apply.
-low temperature
-low pressure
-hot
- watery fluids.
- dry land
- weather
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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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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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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:
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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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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