Across
- 3. The process of turning used waste and material into something new.
- 4. A form of pollution.
- 5. Solar power is an example of a __________ source of energy.
- 7. An example of a greenhouse gas.
- 8. To use a material over and over again.
- 9. The gradual heating of the Earth's surface.
- 11. The __________ effect is the process that occurs when gases in the Earth's atmosphere traps heat from the sun.
Down
- 1. The average weather conditions in a large area for a very long time.
- 2. The process of cutting down trees and not replanting them.
- 6. Coal and gas are examples of __________ __________.
- 10. A large body of ice and snow.
- 12. The home of an animal or plant.