Soil Conservation

3. the solid layer of rock beneath the soil
6. soil organism that breaks down the remains of organisms and digests them
7. dark colored organic material in soil
9. plowing fields along the curves of a slope to prevent soil loss
10. rich, fertile soil that is made up of about equal parts of clay sand and silt
11. the layer of soil beneath the topsoil that contains mostly clay and other materials
13. the planting of different crops in a field each year to maintain the soil's fertility

1. the rate in which water and air move through soil
2. the process by which water ice, or wind or gravity moves rock particles
4. the management of soil to prevent its destruction
5. a measure of how well soil supports plant growth
6. the area of the great plains where wind erosion caused soil loss during the 1930"s
8. the dead stalks from the previous years crop are left in the ground to hold soil in place
11. the layer of soil that differs in color and texture from the layers above or below
12. the loose, weathered material on Earth's surface in which plants can grow