Erosion

Question 1

Wind:
Explanation/Example
Affect on sediment
Geologic features formed

Answer 1

Explanation/Example:

• Picks up loose sediment such as sand, silt and clay
• Occurs in deserts and beaches with little vegetation

Affect on sediment:
-Abraded rock and polishes them into smooth and angular shapes with potted surfaces

Geologic features formed:
Ventifacts

Question 2

Water:
Explanation/Example
Affect on sediment
Geologic features formed

Answer 2

Explanation/Example:
Streams
-Predominant agent of erosion
-Abraded sediment
-Suspension, solution, traction and flotation

Affect of sediment:
-Abrades sediment as it carries them in the water, smooths out and rounds them

Geologic features formed:

• V-shaped valley forms due to stream flow, contour lines take on v-shape
• Sediments abrading stream, water moves fastest in the middle and Delta forms at end of stream

Question 3

Glaciers:
Explanation/Example
Affect on sediment
Geologic features formed

Answer 3

Explanation/Example:

• A large mass of moving ice
• Moves tremendous amount of sediment and scours the land

Affect on sediment:
-Sediments unsorted and jagged with striations

Geologic features formed:
-Forms U-shaped valley

Question 4

Stream Discharge:

Answer 4

Amount of water flowing in a stream

Question 5

Stream Flow:

Answer 5

• Inner Curve
• Outer Curve
• Flows fastest in the center of stream just under the surface
• Downcuts here into the bedrock and creates a v-shape stream bed

Question 6

Inner Curve:

Answer 6

Flows slower, so deposition is dominant, less water and there is more friction slowing the flow of the water

Question 7

Outer Curve:

Answer 7

Flows faster, so erosion is dominant, water has a lot of energy that is directed to the outer bank

Question 8

IDOE:

Answer 8

Inner Curve
Deposition
Outer Curve
Erosion

Question 9

Gravity:
Explanation/Example
Affect on sediment
Geologic features formed

Answer 9

Explanation/Example:
Mass Wasting
-Due to gravity alone
-Landslides, mudflow, slump, earth flow, rock falls, hillside creep, avalanches

Affect on sediment:
-Jagged pile of unsorted sediment

Geologic features formed:
Talus
-unsorted sediment pile