1. Erosion and Deposition
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2. What is Erosion? Three processes must take place:
Moving of rock material from one place to a new location.
Three processes must take place:
detachment of particles
lifting them
transporting them
What is Erosion?

3. Flowing water
Moving ice
Waves
Gravity
What are the agents of erosion?

4. Transports sediments and large particles by fast moving streams or rivers.
It is the most influential force in reshaping the land.
What Is Water Erosion?

5. Relentless pounding erodes softer/weaker rock first while harder/more resistant left behind.
Can take over 100 years to weather and erode a rock into sand.
Energy of waves and chemicals contained in the water erode the rock off the coastline.
What Is Wave Erosion?

6. Sediments are carried away with the force of the wind
Sediments are carried away with the force of the wind. This process is responsible for the creation of deserts such as the Sahara and the Gobi.
Suspended particles may cause weathering on solid objects by abrasion (rubbing).
Occurs in areas where there is not enough rainfall to support vegetation.
What is wind erosion?

7. What Is Gravitational Erosion?
Mass downward movement of rock and sediments, due primarily to the force of gravity. Streams and glaciers move material from higher  to lower  elevation. Occurs continuously on all slopes, slow moving or sudden movement until equilibrium is reached.
What Is Gravitational Erosion?

8. What Is Glacial Erosion?
Ice moves and carries rocks, grinding the rocks beneath the glacier.
Abrade (abrasion) cuts into the rock under the glacier smoothing polishing the rock surface.
Plucking occurs when water enters cracks under the glacier freezing and breaking off pieces of rock that are then carried by the glacier.
What Is Glacial Erosion?

9. The laying down of sediment that has been transported by a medium such as wind, water, or ice.
Process of erosion stops: when the moving particles fall out of the transporting medium and settle on a surface.
What is deposition?

10. What is wind deposition?
Material is deposited when the wind changes direction or loses its strength.
What is wind deposition?

11. What is water deposition?
Running water enters a large, fairly still body of water and its speed decreases speed. As the speed of the water decreases, the water's ability to carry sediment also decreases. The sediments are deposited in streams, rivers, lakes, and oceans.
Running water deposits sediments where the slowing water can no longer move them.
Largest particles are deposited near the shore.
Increasingly smaller particles settle out farther from the shore where the water is calmer.
What is water deposition?

12. Glacial flows of ice become slower when the ice begins melting.
Deposits left by glaciers:
Outwashes are deposits similar to those left by rivers.
Large chunks of broken rock deposited at the base and sides of the glacier as it melts and recedes are called Moraines.
When the glacial ice melts, smaller material is carried by the rivers.
What is ice deposition?

13. What’s the Difference? EROSION – Think of a road and traveling.
WEATHERING – Think of weather wearing rock down or breaking.
EROSION – Think of a road and traveling.
DEPOSITION – Think of depositing money into a bank.
What’s the Difference?
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14. Water Erosion
Wind Erosion
Wave Erosion

15. EROSION – Think of a road and traveling.
WEATHERING – Think of weather wearing rock down or breaking.
EROSION – Think of a road and traveling.
DEPOSITION – Think of depositing money into a bank.