Across
- 3. where huge amounts of waste are buried
- 6. wall-like structure that blocks the natural flow of rivers
- 9. type of gas that traps heat in the atmosphere
- 11. machine with blades that spins to make electricity.
- 13. the amount of carbon dioxide we cause.
Down
- 1. when energy comes from natural sources and can be replenished
- 2. collects sunlight
- 4. energy made from plants or animal waste.
- 5. another term for hydropower
- 7. material like plants, wood, animal wastes
- 8. fuel that's less harmful to the environment; made from living things
- 10. energy that can be produced in volcanic areas
- 12. energy that depends on the weather conditions