1. Erosion

2. Process by which soil and rock are removed from the Earth’s surface by natural processes and then transported and deposited in other locations.
What is it?

3. Agents of Water Erosion
Rainfall
Coastal
Floods
Thawing
Rivers and streams
Glaciers
Freezing
Agents of Water Erosion

4. Raindrop creates a small crater, when drop rate is faster than infiltration, surface erosion occurs
Rainfall

5. Continued water flow deepens water and also extends into hillside
Wearing away of banks
Melting and weakening of permafrost due to moving water, causes weakened banks to fall
Rivers and Streams

6. Coastal Currents and waves pounding coastline
Seawater can dissolve rocks
Sediment being carried away, and not replaced
Coastal

7. Glaciers Scrape the bed, which polishes and gouges underlying rocks
Pieces of bedrock to crack off
Freeze to bed, when glacier moves, moves the bed with it
Glaciers

8. Floods
Cause local erosion by taking up bedrock and forming pothole-type features

10. Water in cracks, freeze and expand, breaking rock into several pieces can lead to gravity erosion
Morning thaws can drop rocks onto road
Freezing and Thawing

11. Other Agents of Erosion
Wind
Gravity
Exfoliation
Other Agents of Erosion

12. Wind Arid or semi-arid regions Pick up or carry loose particles away
Structures repeatedly struck by airborne particles
Wind

14. Gravity Mass movement downward and outward movement of sediment
Moves material from higher to lower elevations
Occurring along slopes
Can move at any speed
Gravity

16. Rapidly heated by the Sun
Expansion of rock, Rock contracts, Rock piece breaks off
Mostly in deserts
Exfoliation

18. Material is added to land mass
Builds up layers of sediment
Deposition