Soil Crossword

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Across
  1. 2. Solid rock found under the surface.
  2. 3. Plants grow best in the _____________ layer of soil.
  3. 5. Materials that plants and animals need to grow.
  4. 7. ________________ is a layer of soil lying under topsoil.
Down
  1. 1. Process of breaking down rock to become soil.
  2. 4. ________________ is organic matter in soil.
  3. 6. Small particles of earth.