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There is freeze thaw action which mainly occurs in very cold climates(which reach below 0 degrees celsius). What happens is water gets into the cracks in the rocks during the day and feezes at night. Since water expands when it freezes is causes the crack to get bigger and bigger. This goes on and a section of the rock breaks off.

Also there is insulation. this occurs in cliates like a desert where it is hot during the day and cold at night. The surface of the rock heats up and expands slightly during the day but cools down and cotracts slightly at night. This is repeated and layers of the rock begin to peel off like an onion.

There is also another type called salt crystallization. This occurs in dry climates where the temperature averages 26 to 28 degrees. Any salt crystals in the rocks expands to almost 300% their orignal size and will break up the rock.

Finally there is one called pressure release. During erosion rocks may be removed from on top of other rock. The rocks that were removed exerted some pressure on the rocks underneath and when they are removed the rocks expand causing cracks is the rock. These cracks can then be made larger by the other forms of weathering

Abrasion {apex}

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