How Soil Forms

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Across
  1. 2. measure of acidity
  2. 5. the solid layer of rock beneath the soil
  3. 6. the stuff that forms as rock is broken down by weathering and mixes with other materials on the surface
  4. 7. The A horizon is made up of _______, a crumbly, dark brown soil that is a mixture of humus, clay, and other materials.
  5. 8. The B horizon consists of clay and other particles of rock with little humus. This is often called _______.
  6. 10. measure of how well the soil supports plant growth
Down
  1. 1. the C horizon forms as bedrock begins to _____.
  2. 3. decayed organic material in soil
  3. 4. a layer of soil that differs in color, texture, and composition from the layers above or below it
  4. 8. mixture of rock particles, minerals, decayed organic material, water, and air.
  5. 9. soil made up of equal parts clay, sand, and silt