Science book G chapter 3 Erosional Forces
Terms
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- When sediments are blown against something and pile behind it, this is formed.
- Dune
- These are bowl shaped basins caused by glacial erosion on the side of a mountain.
- Cirques
- This erosion is caused by windblown sediments-- like sandblasting
- Abrasion
- The fertile soil on many midwestern farms developed from this...
- Loess deposits
- This kind of erosion can be compared to sandblasting.
- Abrasion
- Large moving masses of ice and snow which leave striations are called....
- glaciers
- What drop sediments when they lose their energy of motion?
- Agents of erosion
- How are boulders, gravel, and sand added to the bottom of glaciers?
- by Plucking
- When you plant vegetation, are you helping to increase or decease vegetation?
- Decrease
- How can you reduce erosion on steep slopes?
-
1) plant vegetaton
2) insert drainage
3) build walls - What kind of mass movement probably occurred if you see trees, walls, and fence posts leaning downhill?
- Creep
- This is the dropping of sediments.
- Deposition
- This is a jumble of material that is deposited by a retreating glacier; can cover a large area.
- Till
- These happen when large blocks of rock break loose from a steep slope and start tumbling.
- Rockfalls
- This type of mass movement happens when loose materials or rock layers slip down along a curved surface.
- Slump
- These are windblown deposits of fine-grained sediments; help form areas of fertile soil.
- Loess
- What do you call the pitting and polishing of rocks by windblown particles?
- Abrasion
- What do you call the process that wears away surface materials and moves them from one place to another?
- Erosion
- This is deposited from a glacier's meltwater.
- Outwash
- When sediment moves slowly down a slope causing trees to tilt, what kind of erosion is this?
- Creep
- What kind of erosion happens after a heavy rain in an area that has thick layers of loose sediments?
- Mudflow
- What happens when wind blows across loose sediment removing small particles and leaving heavier material behind?
- Deflation
- What are the periods when glaciers covered much of the land called?
- Ice Ages
- What are the four agents of erosion?
- Wind, Water, Glaciers, Gravity
- What happens when gravity moves materials downslope?
- Mass Movement
- What kind of glaciers covered most of Earth during the Ice Ages?
- Continental Glaciers
- What is the shape of the valley that the Valley glacier leaves behind?
- U-shaped
- How are slump and creep alike?
- They are both types of mass movement caused by gravity.
- How are creep and slump different?
-
Creep happens slowly; it may show leaning trees, fences, and walls.
Slump happens quickly. The material slips downslope in one mass. It leaves a curved scar. - How would planting trees in a treeless area stop water erosion in an area where it rains a lot?
- Think of at least two ways it would help stop erosion.