erosion. erosion is the process by which sediments are picked up and transported

EROSION

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• Erosion is the process by which sediments are picked up and transported.

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• Erosion is caused by many things.• The things that cause earth’s surface to be

eroded are called agents of erosion.

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• The first agent of erosion is running water.• Running water is the most predominant

agent of erosion.• What does this mean?

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• Water is the driving force behind most erosion.

• That’s why there is very little weathering in hot and dry climates.

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• The second agent of erosion is wind.• Of the erosion that happens in hot and dry

climates, this has the bets chance.• Think of a desert.

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• The next agent of erosion is ice (glacial).• These represent flowing ice and snow.• Sometime things frozen in glaciers can be

transported to exotic areas.• We call these glacial erratics.

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• Gravity is the next agent of erosion.• This simply means gravity itself pulling on our

landforms.• This causes landslide and mudslides.

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• The next agent of erosion is ocean waves.• These play a large part in sediment

transportation.• Oceans both break down a beach and deposit

minerals on them and surrounding areas.

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• Finally, the last agent of erosion is man.• When we dig mines, build dams, or create

artificial lakes, we are such agents.• Deforestation and poor farming can also

cause this.

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• So the six agents of erosion are…– Running Water– Wind– Ice (Glacial)– Gravity– Ocean Waves– Man

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• Evidence can be found as to which agent has been in action.

• If the sediment has been transported by a stream, smooth, round particles are formed.

• Valleys that are eroded by a river or stream are V-shaped.

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• Particles that have been eroded by wind are generally rough, pitted and round.

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• Glacial sediment will be sub-rounded and scratched.

• Valleys formed by glaciers will be U-shaped.

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• Lastly, particles that have undergone gravitational erosion will be jagged and sharp.