Weathering, erosion, transportation and deposition Flashcards

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1
Q

What is erosion?

A
  • refers to the wearing away of the land surface

- removal of materials by river and sea water, ice and wind

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2
Q

What are the four main processes of erosion?

A
  • hydraulic action
  • solution
  • abrasion
  • attrition
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3
Q

What is transportation?

A
  • movement of material in the sea and along the coast
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4
Q

What are the types of transportation?

A
  • longshore drift
  • traction
  • solution
  • saltation
  • suspension
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5
Q

When does marine deposition occur?

A
  • when waves are low energy
  • when rapid coastal erosion provides an abundant supply of material
  • sand/shingle accumulate faster than erosion takes place
  • as waves slow following breaking
  • as water pauses at the top of the swash before breaking begins
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6
Q

What is aeolian deposition?

A
  • temporary entrapment, transport and deposition of sediment by wind
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7
Q

What is sub-aerial weathering?

A
  • processes that slowly break down the coastline
  • weaken underlying rocks
  • allow sudden movements or erosion to happen easier
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8
Q

How is material broken down by weathering?

A

in situ

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9
Q

What is an example of physical/mechanical weathering?

A

freeze-thaw weathering

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10
Q

What is biological weathering?

A
  • breakdown of rocks by action of vegetation and coastal organisms
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11
Q

What is chemical weathering?

A
  • when rocks are exposed to air and moisture so chemical processes take place
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12
Q

What are examples of chemical weathering?

A
  • solution
  • oxidation
  • carbonation
  • hydrolysis
  • hydration
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