Science

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Across
  1. 2. Substance that provides nourishment for growth
  2. 5. Compound of nitrogen and oxygen found in air, soil, water, and some food
  3. 7. Animal without back bone
  4. 10. Cycle process by which nitrogen and its compounds are interconverted
  5. 11. The process of rotting/Decay
  6. 12. Chemical or natural substance added to soil
  7. 13. Colorless gas
Down
  1. 1. Element found in blood, muceles, nerves
  2. 3. Community with organisms and there physical environments
  3. 4. An aquatic group such as lobster,barnicales,crabs
  4. 6. Bacteria Tiny organism that grows by fission or forming spores
  5. 8. Salt or ester of nitrous acid
  6. 9. Soft silvery-white reactive metal of the alkali metal group