Lesson Introduction Soil is composed of decayed plants and animals, minerals, and bits and pieces of weathered rocks.
Soil provides many of the basic nutrients most plants use in order to grow.
Earthworms, moles, ants and many other animals make their homes in the soil. As these creatures dig and move they loosen and mix the soil with air. Their movement, along with the movement of the wind and rain allow water to seep down into the soil as well and create further weathering of the rocks below. Soil is comprised of three layers. First you find topsoil.