Across
- 6. composed of different kinds of molecules, can be physically separated
- 9. a type of change that doesn't make a new substance
- 10. an overgrowth of algae caused by excess nutrients in water
- 13. 2 or more atoms bonded together
- 16. all the water on Earth
- 17. an area of land that drains into a river and its tributaries
- 18. 1 kind of atom
- 19. a type of change that makes a new substance
- 21. coal, oil, and natural gas are these types of fuel
- 22. what you start with in a chemical reaction
- 23. composed of only one kind of molecule, can't be physically separated
Down
- 1. the amount of suspended sediment in the water
- 2. plant nutrients that cause eutrophication in high amounts
- 3. building block of all matter
- 4. Energy from burning recently living things like trees or ethanol from corn
- 5. living things used to assess water health
- 7. how acidic or basic water is
- 8. a form of energy that produces radioactive waste
- 9. what you end with in a chemical reaction
- 11. able to be replenished
- 12. Energy from the heat within Earth
- 14. 2 or more DIFFERENT kinds of element bonded together
- 15. not able to be replenished
- 20. Energy from the sun