Weathering

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[edit] Mechanical weathering

	Ventifact at the northern rim of Dyngyujökull glacier, Iceland	Boulder of gneiss eroded by the wind in the Qilian mountains, China	Freeze-thaw weathering of a rock in southern Iceland
Salt weathering of a rock in Yehliu, Taiwan

[edit] Chemical weathering

Desquamation

Weathering in limestone. Norway.

Weathering ring pattern, Taiwan

[edit] Pressure release

Exfoliation of granite

Pressure release in granite.

there are three main types of weathering. Physical, biological and chemical. Physical is the breakdown of rocks by the changes of temperature. Biological is the breakdown of rocks by plants and animals. for example, plants growing in a rock. Chemical weathering is the breakdown of rocks by chemicals like acid rain.