Protection of soil from erosion is called:

The upper layer of the soil is called the:

The wearing away of soil by water or wind is called :

Hard, solid parts of the earth are called:

Which is necessary for prevention of soil erosion?

Deforestation refers to:

Which is the second layer of soil?

Which layer of the soil contains moisture and nutrients necessary for the growth of plants?

The processing of wearing away of rocks is called:

What is the process of planting trees in place of trees that are cut down called?