Weathering, Erosion, and Deposition

Weathering, Erosion, and Deposition

Weathering

• The breaking down of landforms, rocks, and minerals

• Can be physical , chemical, or biological

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Physical Weathering

• Water getting into cracks, freezing, and breaking it apart.

• A river pounding against a caynon wall and wearing it down.

• Wind blasting sand at rocks and carving out an arch.

• Glaciers scraping rocks and making them smaller.

• Rocks being made smoother by water in a river.

Chemical Weathering

• Acid rain.

• Rust,

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Biological Weathering

• A tree growing out of a rock and splitting it

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Erosion

• The movement of sediment or soil from one place to another

• Water, wind, and ice all cause erosion

Water Erosion

• A river carries sediments down stream

• Rain washes away soil

• A mudslide flowing down a steep hill

• Flood waters moving soil from one location to another

Wind Erosion

• Wind picks up particles of sand and carries it away

• Wind blowing sand across the beach

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Ice Erosion

• Glaciers carry rocks, soil, and sediments.

• As the glaciers slowly move, it carries the sediments along with it.

• Avalanches carry the sediments along with the snow down the mountainside.

Deposition

• When particles that have been carried away by ice wind or snow are deposited, or dropped, in another location.

• Landforms like sand dunes, moraines, and deltas are created by deposition

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Water Deposition

• Layers of sediments form at the bottom of the ocean.

• Waves drop sand on the beach.

• Rivers slow down by the mouth and deposits the sediments forming deltas.

Wind Deposition

• Sand dunes are formed when the wind drops the sand in a new location.

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Glacial Deposits

• Moraines are formed when a glacier melts and the sediments that it had been carrying get dropped in a new place.

Video clip

https://www.youtube.com/watch?v=qGw1yB10lX0