Science

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Across
  1. 4. Building block of nucleic acids
  2. 7. preserved to become a fossil
  3. 9. Basic unit of matter
  4. 11. Measuring the depth of water
  5. 12. Part of cell with a specific job
  6. 13. A gas, the first element
  7. 14. Underwater mountain greater than several hundred meters
  8. 15. Going in different directions
Down
  1. 1. Mixture without uniform composition
  2. 2. Atoms bonded together
  3. 3. A proposed explanation
  4. 5. When water fills in all open spaces of a dead organism
  5. 6. Mixture with uniform composition
  6. 8. Building up molecules
  7. 10. Average weather over a long period of time