1. Erosion and Deposition

2. Erosion is the movement of sediment by wind, ice, water, or gravity.
What is Erosion?
Erosion is the movement of sediment by wind, ice, water, or gravity.

3. What is Deposition?
The process by which sediment drops out of the wind, water, ice, or gravity that carried it.

4. Gravity
Sediment falls

5. Gravity Erosion
Angle of Repose is the steepest angle, or slope at which a material will not slide down.

6. gravity moves material down a slope
Gravity Deposition
Mass Movement
gravity moves material down a slope
Landslide - rock & soil quickly move
Slump – rock & soil suddenly fall, big mass
Creep –rock and soil slowly move
Mudflow - mud
Avalanche - snow

8. What type of mass movement is each picture?
LANDSLIDE
MUDFLOW 2 1
What type of mass movement is each picture?
CREEP
SLUMP 4 3

9. Ice (glaciers) carry sediment.

10. Ice Erosion
Continental Glaciers – covers continent. Flattens / smoothes land
Kettle Lakes
Alpine Glacier – in the mountains. Land made rugged.
Horns – sharp pyramid shaped peaks
U-Shaped Valleys

11. Ice Deposition
Tills – unsorted, deposited rock material Moraines – ridges along edge of glacier Stratified Drift – layers of rock deposited based on size Outwash plain – large area of drift

13. Which type of glacier or landform is represented in each picture?
Continental Glacier
Alpine Glacier 2 1 2 1
Which type of glacier or landform is represented in each picture?
Kettle
U Shaped Valley 3 4 3 4

14. What did glaciers create in each picture?1 2
Outwash Plain
Southeast, Alaska
Moraine
Thompson Glacier,
Canadian Arctic
What did glaciers create in each picture?

15. Wind
Wind blows sediment.

16. Wind Deposition
Sand Dunes – mounds of wind deposited sand. Move in direction of wind.
Loess – thick deposits of fine-grained, wind blown sediment

18. Water
Water (rivers, oceans, rain, etc.) washes sediment after being weathered

19. Water Erosion Sea Cliffs – rock wears away
Sea Caves – hole in rock created by waves near cliff
Sea Arches – waves cut hole completely through rock in a sea cave
Sea Stacks – offshore column of rock once connected to the mainland

20. What did water erosion create in each of these pictures?5
SEA ARCH 2 3 1 2 1 1 3
SEA CAVE
SEA CLIFFS 4 5 6 4 2 4
SEA STACKS
What did water erosion create in each of these pictures?

22. Water Deposition
Deltas – slow river current drops sediment in fan-shaped pattern at end of river
Sand Bars – offshore deposit of sand, gravel, or shell material
Alluvial Fans
Beaches – deposited sand

24. What did water create in each of these pictures? 5 2 3 1 2
SANDBAR
DELTA
BEACH 1 4 4 6 4
ALLUVIAL FAN
What did water create in each of these pictures?