Energy and Material Resources

2. The percentage of energy that is used to preform work.
4. An energy-rich substance formed from the remains of organisms.
5. Heat from Earth's interior.
7. Material that blocks heat transfer between the air inside and outside a building.
10. A resource that is either always available or is naturally replaced relatively quickly.
12. energy-rich chemical compound that contains carbon and hydrogen atoms.
14. A change from one form of energy to another; also called a energy coversion.
18. Energy from the sun
20. A compound made from oil.
21. Liquid fossil fuel;oil
24. The process of buring a fuel

1. Electricity produced using the energy of flowing water.
3. The central core of an atom that contains the procons and neutons.
6. The practice of reducing.
8. A mixture of gasoline and alcohol.
9. A substance that provides energy as the result of a chemical change.
11. The splitting of an atom's nucleus into two smaller nuclei and neutron.
13. Fuel made from living things.
15. The part of a nuclear reactor.
16. The daily rise and fall of Earth's waters on its coastlines.
17. A uranium rod that undergoes fission in s nuclear reactor.
19. The combining of two nuclei to produce a single larger nucleus and much energy.
22. A factory in which crude oil is heated and seperated into fuels and other prodcuts
23. A dangerous condition in which fuel rods inside a nuclear reactor melt.