Across
- 4. Solar energy is the indirect ___ of wind energy and hydropower
- 6. The main use of hydrogen was for fuel for this vehicle
- 7. This type of light bulb is more efficient than the incandescent bulb
- 11. A factory where fuels and oil products are made from crude oil
- 12. Chemical compounds made of carbon and hydrogen
- 15. Wood, plant parts, manure, and food wastes that can be used as fuels
- 17. This occurs in a nuclear power plant when fuel rods overheat
- 18. One of the three needs for fuel, besides transportation and heating/cooling
- 20. These types of fuels are formed when organism remains are buried and changed by heat and pressure
- 21. Compounds made from oil
- 22. Oil in the U.S. is mainly used for this
- 23. The three main fossil fuels are oil, coal, and this
- 25. Hydropower is made from ___ water
- 26. A layer of material which traps air
- 28. Something that produces energy after undergoing a chemical change
Down
- 1. A mixture of gasoline and alcohol used as fuel for cars
- 2. In a nuclear power plant, nuclear fission occurs in the ___ vessel
- 3. The simplest element known to man
- 5. Energy that is light and heat from the sun
- 7. Two nuclei combining is nuclear ___
- 8. Reducing energy use
- 9. Cannot be replenished in a practical amount of time
- 10. Will not run out for a very long time, or can be refilled in a relatively short period of time
- 13. The amount of energy actually used
- 14. Hydrogen is an example of this; it contains energy
- 16. Energy made from heat from Earth's interior
- 18. One of the two ways to obtain hydrogen, besides steam reforming
- 19. The main use of it in the U.S. is electric power
- 24. One nucleus splitting apart is nuclear ___
- 27. This type of energy is renewable, but can be very bad for the environment if it explodes