physical weathering Flashcards

1
Q

freeze thaw

A

water becomes trapped in fissures freezes and expands (9%), exerting pressure which may lead to rock breakdown

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2
Q

salt crystal growth

A

saline water enters cracks, leaving behind salt which expands up to 300%. most effective at temps of 27 degrees

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3
Q

thermal expansion

A

heating and cooling of a rock causes it to expand and contract, weakening the rock. limestone is not a good conductor so heats and cools quickly,and breaks down faster

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4
Q

vegetation

A

growth of roots in cracks and crevices exploits them

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5
Q

pressure release

A

reduction of pressure on rock by surface unloading means the rock is able to expand. leads to fracturing of rock

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