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Erosion & Deposition Mr. Skirbst Life Science Topic 21
Erosion Movement of particles from place to place
Deposition Settling of particles in a new place
5 Agents of Erosion
5 Agents of Erosion 1.Gravity 2.Wind
5 Agents of Erosion 1.Gravity 2.Wind 3.Water (running on surface)
5 Agents of Erosion 1.Gravity 2.Wind 3.Water 4.Ice
5 Agents of Erosion 1.Gravity 2.Wind 3.Water 4.Ice 5.Waves
Other Agents of Erosion Biological activity Extraterrestrial Material
1 - Gravity
Mass wasting – downhill movement of sediments
1 - Gravity Mass wasting – downhill movement of sediments Examples: 1- landslides 2- mudslides 3- avalanche
2 - Wind Erosion (Aeolian) Deflation – movement of loose material (clay, silt, sand) - small particles carried farther that larger
2 - Wind Erosion (Aeolian) Abrasion – wearing away and “blasting” of exposed rock
2 - Wind Deposition Dunes – mound of sand deposited by wind
2 - Wind Deposition Loess – fine sand and silt deposited in layers far from place of origin
3 - Running Water 3 Forms of erosion 1. Runoff – flow of water over the land surface
3 - Running Water 1.Runoff Factors affecting runoff:
3 - Running Water 1.Runoff Factors affecting runoff: a. – rainfall amount
3 - Running Water 1.Runoff Factors affecting runoff: a. – rainfall amount b. – shape / slope of land
3 - Running Water 1.Runoff Factors affecting runoff: a. – rainfall amount b. – shape / slope of land c. – plant growth & density
3 - Running Water 1.Runoff Formations from runoff:
3 - Running Water 1.Runoff Formations from runoff: a. – rills: tiny grooves in ground
3 - Running Water 1.Runoff Formations from runoff: a. – rills: tiny grooves in ground b. – gullies: wide, deep rills
3 - Running Water 2.Streams – flow of water through a small valley (deep gully)
3 - Running Water 2.Streams – flow of water through a small valley (deep gully) - formed from gullies joining
3 - Running Water 2.Streams – flow of water through a small valley (deep gully) - formed from gullies joining Streamload – particles carried by stream water
3 - Running Water 3.Rivers– flow of water through a valley formed by streams joining together
3 - Running Water 3.Rivers– flow of water through a valley formed by streams joining together Tributaries – rivers that flow into a major river
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
4 – Ice Glaciers – Valley glaciers in mountain regions carve out mountains
4 – Ice Glaciers – Valley glaciers in mountain regions carve out mountains Continental glaciers during ice ages created a erosional and depositional features
5 – Waves Oceans – result in coastal erosion due to long-shore drift, waves, and storms
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