Heavy rainfall favours the formation of acid soils because it

Heavy rainfall can favour the formation of acid soils because it causes more leaching of base elements from the soil. As rainwater percolates through the soil, it dissolves and carries away minerals such as calcium, magnesium and potassium, which are essential for soil pH buffering. When these base elements are leached out of the soil, the soil pH becomes more acidic. In contrast, in areas with low rainfall, the base elements may accumulate in the soil, buffering the pH and preventing soil acidification. Therefore, heavy rainfall can contribute to the development of acidic soils.