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

Movement of particles from place to place Erosion Movement of particles from place to place

Settling of particles in a new place Deposition Settling of particles in a new place

5 Agents of Erosion

5 Agents of Erosion Gravity

5 Agents of Erosion Gravity Wind

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

5 Agents of Erosion Gravity Wind Water Ice

5 Agents of Erosion Gravity Wind Water Ice Waves

Other Agents of Erosion Biological activity Extraterrestrial Material

1 - Gravity

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 Runoff Factors affecting runoff:

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

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

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

3 - Running Water Runoff Formations from runoff:

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

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

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

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

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

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

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