What is a fetch ?

area of ocean or lake surface over which the wind blows in an essentially constant direction, thus generating waves the term also is used as a synonym for fetch length which is the horizontal distance over which wave-generating winds blow

Explanation:

a warm, wet climate will produce the highest rate of weathering. the warmer a climate is, the more types of vegetation it will have and the greater the rate of biological weathering (figure below). this happens because plants and bacteria grow and multiply faster in warmer temperatures.