Across
- 4. neutron absorbing, slows down process of nuclear fission
- 6. substance that provides energy
- 10. heat from earth that warms magma
- 11. coal, oil, natural gas
- 15. each atom has one proton, less dense than air, rises fast
- 16. comes from crops and things that were once living
- 17. adding alcohol to gasoline
- 18. factory where crude oil is heated and separated into other fuels
- 19. heat from earth's interior
- 22. compounds made from oil
- 24. helps process of nuclear fission, U-235
- 26. produces power by wind, flow of water, steam or gas
- 27. collects wind which spins to make energy
- 28. percentage of energy that is used to perform work
Down
- 1. chemical compounds that contain carbon and hydrogen atoms
- 2. made of silicon and converts sunlight directly into energy
- 3. central core of an atom that contains protons and neutrons
- 5. comes from sources like ethanol that were once living
- 7. energy released during nuclear fission or fusion
- 8. breaking apart
- 9. part of nuclear reaction where fission occurs
- 12. reducing energy
- 13. resource that can be replenished in a relatively short period of time
- 14. putting together
- 15. comes from the force of moving water
- 20. fuel rods generate so much heat they start to melt
- 21. made in the sun's core in process of nuclear fusion
- 23. layer of material that traps air to block transfer of heat between inside and outside
- 25. cool air blown from the sea onto land