Here's the Dirt
Over 70 percent of the earth's surface is covered by water. Most of the rest of the earth is covered by soil.
Soil is made up of minerals from bits of rock, and decayed material from dead plants and animals. Most soil has two layers. The upper layer is called topsoil and this is the fertile layer where plant life grows.
The bottom layer is called subsoil and is made mostly of weathered rock bits. Both layers of soil rest on hard bedrock which is part of the earth's crust.
Soil is one of the most important gifts of the earth. Soil supplies nourishment for plants and who depends on plants for food? We do! And animals do too!
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