Plant and soil science

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Across
  1. 1. an underground layer of gravel, earth or porous rock that contains water?
  2. 2. the mineral matter of soil
  3. 3. Duration of weathering
  4. 5. The process of plants making their own food
  5. 7. The plants and animals that assist in creating soil
  6. 8. The hills and valleys of the ground
  7. 10. large soil particles (sand)
  8. 11. Very small soil particles
Down
  1. 1. Soil particle
  2. 4. an element contained in soil that is critical to the production of amino acids in plants
  3. 6. A rising or falling surface
  4. 9. The presence of oxygen in soil