Give a geographical reason for each of the following:

(i) Physical weathering is also called mechanical weathering.

(ii) Physical weathering is more rapid in desert climates.

(iii) Chemical weathering occurs in moist and cold climates.

(i) Physical weathering is also called mechanical weathering as it involves rock disintegration without any change in the chemical constituents of the rock.

(ii) Physical weathering is more rapid in desert climates because temperature changes are sharpest in a desert.

(iii) Chemical weathering occurs in moist and cold climates because such climate has abundant water and oxygen which are the main agents of chemical weathering.