Across
- 4. what oil and coal have
- 6. dioxide what coal and oil released into the air
- 7. the word for underground Heating and Cooling
- 8. this comes from the sun
- 9. what we fight over in the Middle East
- 10. the word for something that cannot be used again
Down
- 1. can be used over and over
- 2. is clean energy but not a renewable resource
- 3. gases the stuff in are that is heating up the Earth
- 4. we burn this for most of our electricity
- 5. uses dead things to make electricity