Erosion & Deposition

1. Erosion & Deposition Mr. Skirbst Life Science Topic 21

2. Erosion Movement of particles from place to place

3. Deposition Settling of particles in a new place

4. 5 Agents of Erosion

5. 5 Agents of Erosion • Gravity

6. 5 Agents of Erosion • Gravity • Wind

7. 5 Agents of Erosion • Gravity • Wind • Water (running on surface)

8. 5 Agents of Erosion • Gravity • Wind • Water • Ice

9. 5 Agents of Erosion • Gravity • Wind • Water • Ice • Waves

10. Other Agents of Erosion Biological activity Extraterrestrial Material

11. 1 - Gravity

12. 1 - Gravity Mass wasting – downhill movement of sediments

13. 1 - Gravity Mass wasting – downhill movement of sediments Examples: 1- landslides 2- mudslides 3- avalanche

14. 2 - Wind Erosion (Aeolian) Deflation – movement of loose material (clay, silt, sand) - small particles carried farther that larger

15. 2 - Wind Erosion (Aeolian) Abrasion – wearing away and “blasting” of exposed rock

16. 2 - Wind Deposition Dunes – mound of sand deposited by wind

17. 2 - Wind Deposition Loess – fine sand and silt deposited in layers far from place of origin

18. 3 - Running Water 3 Forms of erosion 1. Runoff – flow of water over the land surface

19. 3 - Running Water • Runoff Factors affecting runoff:

20. 3 - Running Water • Runoff Factors affecting runoff: a. – rainfall amount

21. 3 - Running Water • Runoff Factors affecting runoff: a. – rainfall amount b. – shape / slope of land

22. 3 - Running Water • Runoff Factors affecting runoff: a. – rainfall amount b. – shape / slope of land c. – plant growth & density

23. 3 - Running Water • Runoff Formations from runoff:

24. 3 - Running Water • Runoff Formations from runoff: a. – rills: tiny grooves in ground

25. 3 - Running Water • Runoff Formations from runoff: a. – rills: tiny grooves in ground b. – gullies: wide, deep rills

26. 3 - Running Water • Streams – flow of water through a small valley (deep gully)

27. 3 - Running Water • Streams – flow of water through a small valley (deep gully) - formed from gullies joining

28. 3 - Running Water • Streams – flow of water through a small valley (deep gully) - formed from gullies joining Streamload – particles carried by stream water

29. 3 - Running Water 3. Rivers– flow of water through a valley formed by streams joining together

30. 3 - Running Water • Rivers– flow of water through a valley formed by streams joining together Tributaries – rivers that flow into a major river

31. 3 - Running Water • Rivers– flow of water through a valley formed by streams joining together Tributaries – rivers that flow into a major river Watershed – entire area drained by a single river

32. 4 – Ice Glaciers – Valley glaciers in mountain regions carve out mountains

33. 4 – Ice Glaciers – Valley glaciers in mountain regions carve out mountains Continental glaciers during ice ages created a erosional and depositional features

34. 5 – Waves Oceans– result in coastal erosion due to long-shore drift, waves, and storms