How Soil Forms

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Across
  1. 5. plants shed leaves and forms a loose layer.
  2. 7. reacts strongly with some metals and changes blue litmus paper red.
  3. 8. equal parts clay, sand, and silt.
  4. 9. layer of soil that differs in color and texture from other layers.
  5. 11. consists of clay and other particles.
  6. 12. dark colored substance that forms as plant and animal remains decay.
Down
  1. 1. measure of how well the soil supports plant growth.
  2. 2. solid layer of rock beneath the soil.
  3. 3. organisms that break the remains of dead organisms into pieces and digest them with chemicals.
  4. 4. substance that changes red litmus paper blue.
  5. 6. crumbly dark brown soil that is a mixture of humus, clay, and other minerals.
  6. 10. loose weathered material on earth's surface