Give geographical reasons:Chemical weathering occurs in areas of heavy

1.	Give geographical reasons:Chemical weathering occurs in areas of heavy rainfall.
Answer» The rain water travels through the atmosphere before reaching the ground. Carbon dioxide in the air gets mixed in the water in this process. Dilute carbonic acid gets formed. Materials like limestone get easily dissolved in such acids leading to weathering of rocks. Some minerals in the rock gets dissolved in water. Limestone is formed due to chemical precipitation between water and alkalis. Similarly, because of the solution, alkalis in the rock dissolves and make them brittle. Oxidation process occurs in rocks which have iron present in them. The iron in the rock comes in contact with water and a chemical reaction takes place between iron and oxygen. Hence, a reddish coloured layer forms on the rocks. This is called rust.

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