Energy Sources

1. The ability to do work
3. Energy derived from heat stored within the Earth's crust
6. Organic material that is converted into fuel/energy
8. The generation of electricity using the force of moving water to spin turbines
11. A device that converts solar energy directly into electricity
13. Gases or pollutants released into the air from artificial sources
14. Energy derived from sources that are naturally replenished on a human timescale
15. A secondary energy source, or "energy carrier," created by converting primary sources

2. The use of less energy to provide the same service or output, minimizing waste
4. Energy derived from sources that do not replenish on a human timescale
5. A rotating machine that extracts energy from a fluid and converts it
7. A colorless, odorless, and highly flammable greenhouse gas, serving as the primary component of natural gas
9. The result of splitting Uranium atoms via fission
10. Natural, non-renewable energy sources originating from ancient plants and animals
12. Converting the sun's rays into electricity through the use of panels