Across
- 1. compounds made from oil
- 6. chemical compounds that contain carbon and hydrogen atoms
- 7. a renewable energy source that is produced from the Earth
- 9. one of the three major types of fossil fuels that is a liquid and is black
- 10. energy source that uses the sun
- 12. 8% of oil is used for this
- 14. 7% of coal in America is used for this
- 15. resources that take a very long time to be replenished
- 16. a change from one form to another
- 17. energy rich substances formed from the remains of an organism
- 18. a method to take out chemicals from fuel
- 20. 71% of coal in America is used for this
- 22. a renewable energy that is made by the uneven heating of the earth's radiant energy
- 24. 13% of coal in America is used for this
- 27. a renewable energy that uses electrolysis to separate the hydrogen atoms from water and can also be taken from biomass and natural gas and hydrogen is a major energy source
- 29. wood and food wastes that can be used as fuels
Down
- 2. resources that can be replenished in a short amount of time
- 3. electricity produced by moving water
- 4. 61% of oil in America is used for this
- 5. a way to collect solar energy
- 8. the most used energy source in America
- 11. is a substance that provides energy
- 13. 8% of oil in America is used for this
- 19. oil heated and separated into fuels
- 21. when the nucleus splits apart from an atom to generate energy
- 23. another name for oil
- 25. adding alcohol to gas
- 26. 1% of coal is used for this
- 28. the machine that spins wind and water to make energy