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Questions and Answers
What type of channel is composed of loose alluvial sediments?
Which process involves the erosion that occurs when particles scrape against each other?
What process involves the erosion and transport of large chunks of rock?
What happens during plucking that causes rocks to weaken and potentially be carried by a glacier?
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Which type of channel is less free to adjust due to the solid confines of the rock?
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What can be thought of as having a sandpaper-like effect on rocks?
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Which process helps shape bedrock channels through erosion?
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What concept helps us understand the rate of energy loss on a channel bed that can lead to erosion?
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What can happen when a flood of water freezes in a river?
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How are bedrock channels different from alluvium?
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Which process can be driven by the work done through stream power?
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What happens to energy when it hits something in a channel bed?
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In the context of the text, what is alluvium?
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Which term can best be associated with the concept of bedrock?
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What term is used to describe the rate of energy loss on a channel bed that can lead to erosion?
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In the context of the text, what is the primary process by which work is done to cause erosion in channels?
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What is the main difference between bedrock and alluvium in terms of their composition?
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What can be inferred about the process of channel erosion from the text?
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How does energy transform when it hits something on a channel bed according to the text?
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What characteristic of bedrock makes it analogous to the foundation of a bed in the text?
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Which term best describes the paths eroded through solid rock structures like earth and rock?
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What is abrasion in the context of the text?
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What is plucking also known as in the text?
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How does plucking contribute to the formation of bedrock channels?
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How are alluvial channels different from channels cut through bedrock?
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Which type of channel is less free to adjust due to the solid confines of the rock?
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What can be thought of as having a sandpaper-like effect on rocks?
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How does abrasion help shape bedrock channels?
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In what way does plucking contribute to abrasive erosion in bedrock channels?
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Study Notes
Bedrock Channels and Formation
- Bedrock channels are eroded paths cut through bedrock, and their formation is a complex process.
- Alluvium is loose sediment that can be easily pushed aside, whereas bedrock is a firm foundation of solid rock.
- Alluvial channels are composed of loose alluvial sediments and are free to adjust due to the loose sediments they carry and deposit.
Abrasion
- Abrasion is the erosion that occurs when particles scrape against each other.
- It has a sandpaper-like effect on rocks and helps form bedrock channels.
- Abrasion can lead to the formation of potholes.
Plucking
- Plucking, also known as quarrying, is a process of forming bedrock channels that involves the erosion and transport of large chunks of rock.
- It occurs in association with the thawing and refreezing of moving glaciers.
- The frozen chunks of rock and sediment clinging to the bottom of a glacier scrape along the landscape, perpetuating abrasive erosion.
Stream Power
- Running water and ice carry a great deal of energy, which can be lost when it hits something.
- The rate of energy loss on a channel bed that can lead to erosion is known as stream power.
- Stream power helps us understand how water can cut channels through hard structures, like earth and rock.
Bedrock vs. Alluvium
- Bedrock is a firm foundation of solid rock, usually covered by loose soil and sediments called alluvium.
- Alluvial channels are free to adjust due to the loose sediments they carry and deposit, whereas channels cut through bedrock are not as free to adjust due to the solid confines of the rock.
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Description
Explore the dynamics of rivers and streams, from gentle flow to powerful floods, and how they shape the land. Learn how bedrock channels and stream power influence the landscape in various weather conditions.
