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Erosion & Deposition Mr. Skirbst Life Science Topic 21.

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Presentation on theme: "Erosion & Deposition Mr. Skirbst Life Science Topic 21."— Presentation transcript:

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 1.Gravity

6 5 Agents of Erosion 1.Gravity 2.Wind

7 5 Agents of Erosion 1.Gravity 2.Wind 3.Water (running on surface)

8 5 Agents of Erosion 1.Gravity 2.Wind 3.Water 4.Ice

9 5 Agents of Erosion 1.Gravity 2.Wind 3.Water 4.Ice 5.Waves

10 Other Agents of Erosion Biological activity Extraterrestrial Material

11 1 - Gravity

12 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 1.Runoff Factors affecting runoff:

20 3 - Running Water 1.Runoff Factors affecting runoff: a. – rainfall amount

21 3 - Running Water 1.Runoff Factors affecting runoff: a. – rainfall amount b. – shape / slope of land

22 3 - Running Water 1.Runoff Factors affecting runoff: a. – rainfall amount b. – shape / slope of land c. – plant growth & density

23 3 - Running Water 1.Runoff Formations from runoff:

24 3 - Running Water 1.Runoff Formations from runoff: a. – rills: tiny grooves in ground

25 3 - Running Water 1.Runoff Formations from runoff: a. – rills: tiny grooves in ground b. – gullies: wide, deep rills

26 3 - Running Water 2.Streams – flow of water through a small valley (deep gully)

27 3 - Running Water 2.Streams – flow of water through a small valley (deep gully) - formed from gullies joining

28 3 - Running Water 2.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 3.Rivers– flow of water through a valley formed by streams joining together Tributaries – rivers that flow into a major river

31 3 - Running Water 3.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


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