Energy

3. energy stored
5. organic matter used as a fuel, especially in a power station for the generation of electricity.
6. relating to the nucleus of an atom.
8. energy released
11. of a natural resource or source of energy existing in finite quantity; not capable of being replenished.
13. a combustible black or dark brown rock consisting mainly of carbonized plant matter, found mainly in underground deposits and widely used as fuel.
14. the strength and vitality required for sustained physical or mental activity.
16. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.

1. energy used by flowing water
2. the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.
4. relating to or produced by the internal heat of the earth.
7. (of a natural resource or source of energy) not depleted when used.
9. flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground (often in association with petroleum) and used as fuel.
10. the perceptible natural movement of the air, especially in the form of a current of air blowing from a particular direction.
12. a viscous liquid derived from petroleum, especially for use as a fuel or lubricant.
15. relating to or determined by the sun