Weathering Flashcards

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1
Q

What is mechanical weathering

A

The breaking down of larger rock into smaller rock

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2
Q

Example of mechanical weathering

A

Freeze thaw weathering

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3
Q

What is chemical weathering?

A

A chemical reaction occurs in the rock causing it to devolve and form new substances.

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4
Q

Example of chemical weathering

A

Limestone dissolves by rainwater forming calcium carbonate in caves.

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5
Q

What is biological weathering?

A

Disintegration of rocks due to the actions of plants/ animals

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6
Q

What is meant by exfoliation?

A

it occurs when sheets or layers of rock split off due to thermal expansion and contraction of minerals.

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7
Q

Explain freeze thaw weathering

A

Water expands when it freezes and exerts a mechanical force on the rocks surrounding it.

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8
Q

what is root action?

A

causes the mechanical and chemical weathering of rocks by the wedging action of a plant roots that may grow along joints and bedding planes.

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9
Q

What is burrowing?

A

Burrowing mixes and brings rock and soil particles to the surface. This facilitates chemical weathering at greater depth, as the burrows can be accessed by atmospheric gas and water.

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10
Q

How does chemical weathering work?

A

Rocks decompose when the chemical structure of their minerals breaks down.

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11
Q

What do chemical weathering reactions produce?

A

All chemical weathering reactions involve water and produce ions that are removed in solution, leaving an insoluble residue, usually clay minerals.

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