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