Erosion and Deposition

1. Erosion and Deposition

2. Breaking Down Processes • Weathering • The breaking down of the earth’s material by natural processes. • Erosion • The process by which weathered rock and soil particles are moved from place to place. • Deposition • The process by which weathered sediments are laid down in a new location creating new landforms.

3. 5 Agents of Erosion • Gravity • Glaciers • Wind • Surface Water / Running Water • Ocean Shoreline / Ocean Waves

4. Gravity • Pulls rock and soil down a slope • Called Mass Movement • Rapid • Rockslides • Mudflow • Avalanche

6. Gravity Slow • Slump • Creep

7. Mass Wasting

8. Glaciers • Carry very large to very small debris • Most powerful agent • Deposits • Form piles called moraines • Drumlins – little mounds • Glacial lakes • Kettle lakes • U-shaped valleys

9. Moraines

10. Drumlins Glacial lakes

11. Kettle Lakes U-shaped valleys

12. Glaciers

13. Glacial Erosion

14. Wind • Removes loose material from the earth’s surface. • Amount of material carried depends on wind speed • Most active in deserts, plowed fields, beaches • Deposits by wind • Loess- layer of fine silt or sand • Dunes- mounds of sand

15. Loess

16. Dunes

17. Wind Erosion

18. Running Water • MAJOR CAUSE OF EROSION • When water moves it carries particle called the load. • Speed of water determines the size of the load • Creates canyons and valleys • River deposits • Delta • Oxbow lake • Flood plains

19. River deltas

20. Oxbow Lakes

21. Flood Plains

22. Waves • Constantly erode and shape the shoreline. • Formation • Sea cliffs • Sea stacks and caves

23. Sea Stacks

24. Sea Stacks & cliffs

25. Cape Flattery, Olympic Peninsula Sea caves

26. Waves Deposits • Beaches • Spits • sand bars • Barrier Islands

28. Barrier Islands

29. Spits & Sandbars

30. Erosion by Brainpop