Weathering is the process of ____ down of rocks. Weathering ____ the surface of the earth. Weathering is of ____ types. Physical weathering is also known as ____ weathering. The sudden rise and fall of ____ causes expansion and contraction of rocks. The sudden contraction and expansion peels off the outer layer known as ____. ____ means reaction of minerals in rocks to atmospheric oxygen. Biological weathering is also known as ____ weathering. ____ is the most active agent of both physical and chemical weathering of rocks. In ____ climate humidity and temperature are constantly high.

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