Across
- 2. fuel made from living things
- 3. energy from the sun
- 6. the percentage of energy that is used to perform work
- 9. a substance that provides energy
- 10. a rod used in a nuclear reactor to absorb neutrons
- 12. a renewable resource
- 13. a machine with turbines used to generate electricity
- 14. electricity produced by flowing water
- 18. the most used thing for electricity production
- 22. gas that comes naturally from the ground
- 23. reducing energy use
- 25. a solid fossil fuel formed from plant remains
- 26. breaking apart
- 27. the central core of an atom that contains protons and neutrons
Down
- 1. an energy rich substance
- 4. a resource that is always available or can naturally be replaced in a short time
- 5. compounds made from oil
- 7. intense heat from earth interior that’s warms the magma
- 8. one form of energy to another
- 11. chemical compounds that contain carbon and hydrogen atoms
- 15. a layer of heating and cooling systems
- 16. part of the nuclear reactor where nuclear fission occurs
- 17. adding alcohol to gasoline
- 19. the process of burning fuels
- 20. a factory in which crude oil must undergo a process
- 21. a natural resource that is not replaced in a useful amount of time
- 24. active solar cells
- 26. coming together