science

3. the process of burning something such as fossil fuels
8. Renewable organic materials, such as wood, agricultural crops or wastes, and municipal wastes
9. is energy made by heat inside the Earth's crust
11. the process of changing one form of energy to another form
12. a compound of hydrogen and carbon, such as any of those that are the chief components of petroleum and natural gas.
13. a liquid mixture of hydrocarbons that is present in certain rock strata and can be extracted and refined to produce fuels including gasoline, kerosene, and diesel oil; also know as oil
15. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.

1. the production of electrical power through the use of the gravitational force of falling or flowing water
2. the central and most important part of an object
4. radiant energy emitted by the sun
5. a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.
6. vessel,
7. a chemical obtained from petroleum and natural gas containing the nuclear reactor coolant, core shroud, and the reactor core
10. mixture of gasoline and ethyl alcohol used as fuel in internal combustion engines
14. a place crude oil is sent to