Across
- 5. plentiful; having more than enough of something
- 6. a mix of different substances
- 8. / renewable energy derived from plants (biomass)
- 9. another choice or option
- 10. power released by reactions within atoms (2 words)
- 15. prepare and use land for growing crops and plants
- 16. more of something than is necessary
- 17. things that pollute
- 18. where something comes from
Down
- 1. allow; say it is OK to do something
- 2. removing a substance from something which contains it
- 3. a fossil fuel which burns well and comes from the remains of trees
- 4. energy sources from the buried remains of plants and animals (2 words)
- 6. use, eat or drink
- 7. A gas which causes global warming (2 words)
- 11. something which can be burned
- 12. the remaining amount of a particular substance
- 13. a gas energy source that comes from under the ground (2 words)
- 14. substances, especially gases, that go into the air
- 16. comes from the sun