Across
- 3. Physical Matter
- 5. A much needed resource for things to grow.
- 7. compactness
- 11. is modified by humans
- 12. found in ocean water
- 14. made from trees.
- 16. refers to the reduction of pH in the ocean.
- 17. to weather away
- 18. a solid inorganic substance of natural occurrence
Down
- 1. temperature nearest the surface.
- 2. gas that has been dissolved into another material.
- 4. a part needed to do photosynthesis
- 6. dissolving or breaking down
- 8. Branch of science that explores the chemical side of science
- 9. not modified by humans
- 10. Amount of salt dissolved in water
- 13. the amount of space a substance occupies.
- 15. chemical element number 7