Across
- 6. large scale cutting of trees
- 8. pollution over a widespread area
- 10. an example of something that is part of the hydrosphere
- 11. all the ground, rocks, and minerals of Earth (nonliving things)
- 13. the layer of gases that surround Earth
- 16. Energy sources that are replaced faster than they are used
- 17. chemical, biological, and physical status of water
Down
- 1. temperatures on Earth have been increasing steadily over the past 100 years
- 2. pollution from 1 source (traced back to one place)
- 3. an example of a renewable energy source
- 4. one of the main gases polluting the atmosphere
- 5. all the living things on Earth
- 7. contamination of the ari by harmful substances
- 9. energy sources that are used faster than they can be replaced
- 12. all the water on and in Earth and in the atmosphere
- 14. an example of a living thing that is part of the biosphere
- 15. an example of a nonrenewable energy source