Why do you think the rate of weathering tends to increase at hotter temperatures and higher amounts of rainfall?

Weathering of rocks increases when temperature increases and in the presence of water.

Weathering refers to the process of breakdown of rocks to form soil. Weathering is therefore the process by which soil is formed. Weathering rate increases in the presence of water because water can facilitate the occurrence of chemical reactions that lead to weathering. Recall that temperature increases the rate of reaction hence temperature increases the rate of weathering.

Secondly, water can enter into the crevices in rocks. As temperature increases and decreases periodically, the water freezes and melts thereby exerting pressure on the rock and leading to rock weathering.

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Explanation:

Both increase in temperature and availability of water drives physical and chemical weathering and increases their rate.

Increase in temperature causes rocks to expand  and molecules are more free to move about. Constantly heating and cooling of a rock can lead to mechanical fracturing or cracks developing.

A high amount of rainfall facilitates chemical weathering. Chemical weathering is the decomposition of rocks.

The main agent that is important for natural chemical processes to occur is the presence water.

Water contains some other dissolved substances in it.

This is evident in tropical regions of the world

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