How is over-irrigation damaging to soil?

a.

It reduces the amount of organic material in soil.

b.

It results in the accumulation of salt near the soil surface.

c.

It increases the acidity of soil.

d.

It removes water from the water table.

The question is asking how over-irrigation is damaging to soil. Over-irrigation means that too much water is being delivered to the soil, and too much water can wash some other important ingredients out - such as organic material. Therefore, the correct answer is: a. It reduces the amount of organic material in soil.