Soil Composition and Formation

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Across
  1. 2. Before soil formed Earth was once barren rock.
  2. 4. This gas is stored in the soil.
  3. 5. Breaking up and wearing away of the parent or bed rock.
  4. 6. Large rocks are broken down into small paricles by rainwater, seawater, rivers or streams.
  5. 8. Plants and animals die and decay, and the acids formed break down the rock further.
  6. 9. Essential in keeping the plant alive.
  7. 10. organisms Organisms that live in the soil and break down the plant and animal remains.
Down
  1. 1. They are made up of sand, clay and silt.
  2. 3. When rains came plants inhabited the new soil.
  3. 7. Dead remains of plants and animals that add nutrients to soil.