Soil

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Across
  1. 4. The management of soil to limit it's destruction.
  2. 5. A measure of how well soil supports plant growth.
  3. 7. Rich, fertile soil that is made up of about equal parts of clay, sand, and silt.
  4. 9. Materials or substances such as minerals, forests, and land.
Down
  1. 1. A range of values used to indicate how acidic or basic a substance is.
  2. 2. The rock that makes up earth's crust; also the solid rock layer beneath the soil.
  3. 3. The process of leaving previous stalks instead of tilling them under.
  4. 6. The crumbly, topmost layer of the soil made up of clay, other minerals, and humus.
  5. 8. Dark colored organic material in soil.
  6. 10. The loose, weathered material on earth's surface in which plants can grow.