Ecology and Chemistry

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Across
  1. 4. Metal+non-metal
  2. 5. Holds protons and neutrons
  3. 6. The planet we live on
  4. 9. Non-metal+non-metal
  5. 10. In the atmosphere
  6. 11. Made from elements
  7. 12. Not charged
  8. 15. H20
  9. 18. In the lithosphere
  10. 19. Negatively charged
Down
  1. 1. Group of a species in a given area
  2. 2. Alive or once living
  3. 3. Needs to be sustainable to function
  4. 6. In the hydrosphere
  5. 7. Can't be broken down
  6. 8. 4
  7. 13. Where an organism fits in an ecosystem
  8. 14. Positively charged
  9. 16. Has never been alive
  10. 17. Has mass and takes up space