Across
- 1. an organism that makes its own food
- 3. an undeerwater vehicle built of strong materials to resist pressure at depth
- 6. the area drained by a river and its tributaries
- 8. the movement of deep, cold, and nutrient rich water to the surface
- 9. two or more atoms held together by bonds
- 11. the tendency of water molecules to stick to eachother
- 13. the amount of space something occupies
- 14. tiny algae and animals that float in water and are carried by waves and currents
- 15. measure of the amount of matter in a substance
- 16. medicine that kills or slows the growth of bacteria
- 18. prepared or created artificially man-made not found in nature
Down
- 1. underground bed or layer yielding ground water for wells and springs etc
- 2. point the temperature below which a solid turns into a liquid
- 4. term that describes an organism that lives on land
- 5. the amount of matter in a given space, mass per unit volume
- 7. the ability of a substance to be hammered or beaten into thin sheets
- 9. attraction between opposite poles
- 10. horizontal row on the periodic table
- 12. nitrogen compounds used for growth by plants and algae
- 17. a measure of how acidic or basic a solution is