Podcast
Questions and Answers
Glaciers are considered reservoirs in the hydrologic cycle.
Glaciers are considered reservoirs in the hydrologic cycle.
What percentage of the non-saltwater supply do glaciers account for?
What percentage of the non-saltwater supply do glaciers account for?
Where can glaciers form?
Where can glaciers form?
What type of glaciers are found in Glacier National Park in Montana and Canada?
What type of glaciers are found in Glacier National Park in Montana and Canada?
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Which continents currently have ice sheets?
Which continents currently have ice sheets?
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When did the last glacial maximum occur?
When did the last glacial maximum occur?
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What is the Pleistocene epoch known for?
What is the Pleistocene epoch known for?
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Which of the following statements about glacier movement is true?
Which of the following statements about glacier movement is true?
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What is plastic flow in the context of glacier movement?
What is plastic flow in the context of glacier movement?
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What causes crevasses in glaciers?
What causes crevasses in glaciers?
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What drives the movement of glaciers?
What drives the movement of glaciers?
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What is the zone of fracture in a glacier?
What is the zone of fracture in a glacier?
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How do glaciers move along the ground?
How do glaciers move along the ground?
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What are crevasses in glaciers?
What are crevasses in glaciers?
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What is the similarity between glacier movement and the movement of rocks in the mantle?
What is the similarity between glacier movement and the movement of rocks in the mantle?
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Which part of a glacier is in the mountains?
Which part of a glacier is in the mountains?
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What are the two main parts of a glacier?
What are the two main parts of a glacier?
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What is the balance between accumulation and wastage called?
What is the balance between accumulation and wastage called?
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What happens if accumulation exceeds wastage?
What happens if accumulation exceeds wastage?
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What are the deposits of rocks and debris left by glaciers called?
What are the deposits of rocks and debris left by glaciers called?
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What causes cracks called crevasses to develop in glaciers?
What causes cracks called crevasses to develop in glaciers?
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What can form on the outwash plain of a glacier due to high sediment and low slope?
What can form on the outwash plain of a glacier due to high sediment and low slope?
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Which of the following is a glacial erosional feature?
Which of the following is a glacial erosional feature?
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What gives glacial meltwater a whitish appearance?
What gives glacial meltwater a whitish appearance?
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What is a hanging valley?
What is a hanging valley?
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What is a horn?
What is a horn?
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What is glacial drift?
What is glacial drift?
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What are the two main processes of glacial erosion?
What are the two main processes of glacial erosion?
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What is glacial polish?
What is glacial polish?
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What are some glacial features that can be seen in the Sierra mountains?
What are some glacial features that can be seen in the Sierra mountains?
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What is the term for the elongated structures created by a glacier moving over hills?
What is the term for the elongated structures created by a glacier moving over hills?
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What is the term for the area in front of a glacier where water is flowing out?
What is the term for the area in front of a glacier where water is flowing out?
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What is the term for the hills created by a glacier moving over them?
What is the term for the hills created by a glacier moving over them?
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What is the term for the small lakes formed when ice gets trapped in the ground moraine?
What is the term for the small lakes formed when ice gets trapped in the ground moraine?
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What is the term for the conical-shaped deposits created when sediment gets trapped in the bottom of a pothole and then falls straight down when the glacier melts?
What is the term for the conical-shaped deposits created when sediment gets trapped in the bottom of a pothole and then falls straight down when the glacier melts?
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During the last ice age, what caused the formation of massive river channels in central and eastern Washington?
During the last ice age, what caused the formation of massive river channels in central and eastern Washington?
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What is the term for the lakes that existed in the past and were massive in size during the ice age?
What is the term for the lakes that existed in the past and were massive in size during the ice age?
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What was the approximate depth of Death Valley when it was covered by ice during the ice age?
What was the approximate depth of Death Valley when it was covered by ice during the ice age?
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What did the melting glaciers during the ice age change in terms of migration?
What did the melting glaciers during the ice age change in terms of migration?
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What is the main factor that caused worldwide change in sea levels during the ice age?
What is the main factor that caused worldwide change in sea levels during the ice age?
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During which epoch was the sea level nearly 330 feet lower than it is today?
During which epoch was the sea level nearly 330 feet lower than it is today?
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What is the current state of the glaciers mentioned in the text?
What is the current state of the glaciers mentioned in the text?
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What is the possible consequence of melting glaciers?
What is the possible consequence of melting glaciers?
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What is the range of sea level change mentioned in the text?
What is the range of sea level change mentioned in the text?
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What is the time period mentioned in the text when the glaciers were mostly gone?
What is the time period mentioned in the text when the glaciers were mostly gone?
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Study Notes
Glacier Movement and Plastic Flow
- Glaciers move like slow-moving rivers and have similar features to rivers
- Some glaciers can move at a speed of 3 to 6 feet per day or 1 to 2 meters per day
- Glaciers generally move very slow over long periods of time
- Glaciers move through plastic flow, similar to the movement of rocks in the mantle
- Plastic flow refers to the solid state of the glacier while still flowing
- The bottom part of the glacier moves at a different speed than the top part, causing crevasses
- The movement of the glacier is driven by pressure and weight, similar to mantle convection driving plate tectonics
- The weight of the glacier itself causes it to move through plastic flow
- The glacier also slips along the ground, facilitated by water underneath it
- The uppermost part of the glacier is called the zone of fracture, where it flows at a different speed
- Crevasses are cracks in the ice caused by the movement of the glacier
- There are videos available to learn more about glaciers and their movement
Glacial Erosion and Deposition
- The valley in the video is mostly filled with water due to glacial melt.
- Many glaciers in the area are disappearing.
- The Sierra mountains were completely covered by ice during the last ice age.
- Glaciers erode through plucking and scouring.
- Glacial erosion creates grooves in the bedrock called striations.
- Meltwater from glaciers contains pulverized rock, giving it a whitish appearance.
- Glacial polish occurs when the bottom of the glacier slides over sand and rocks.
- Various glacial features can be seen in the Sierra mountains, including striations, glacial polish, erratics, tarns, and moraines.
- Erosional features caused by glaciers include glacial valleys, hanging valleys, horns, and cirques.
- A hanging valley is formed when a smaller glacier joins a larger one.
- A horn is a peak eroded on three sides by glaciers.
- Glacial drift refers to any deposit of glacial origin, with till being directly deposited by the ice and stratified drift by meltwater.
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Description
Test your knowledge on how glaciers move and the process of plastic flow with this informative quiz. Learn about the similarities between glaciers and rivers, the different speeds at which glaciers can move, and the factors that drive their movement. Discover the concept of plastic flow and its role in glacier movement, as well as the formation of crevasses. Explore the influence of pressure, weight, and water on glacier movement, and delve into the fascinating world of these icy giants.
