Energy

4. Energy generated by moving water
6. things That are alive, or were alive a short time ago, such as plant material (like wood), or animal waste. Can be used to make biogas for powering machines.
7. energy Heat energy from inside the earth
8. A resource that cannot be depleted, such as solar and wind energy
10. Output compared to input. If a device does as much work for us as energy we put into it, then it is perfectly efficient because it is not wasting any energy
13. energy Energy that does not pollute the environment
14. Practices that can be continued indefinitely, with minimal harm to the natural environment, such as the use of renewable resources
16. energy Stored energy, such as the still water sitting behind a dam, ready to fall.
17. energy Energy from heat
19. Contamination of the natural environment with harmful substances as a consequence of human activities; a byproduct of many energy sources
20. A gas that is the main ingredient of both natural gas and biogas
21. The ability to do work

1. energy The vibrations of molecules as sound waves travel
2. energy Stored energy that can be released through chemical reaction, found in things like food and batteries
3. resource that can be depleted, such as fossil fuels
5. energy Energy of motion. Water flowing over a dam is kinetic energy. Mechanical energy - energy of moving parts pushing or pulling
8. energy The category of energy that includes solar and light energy
9. energy Energy produced by movement of charged particles, such as electrical currents and static electricity
11. energy Energy produced by splitting or joining the centers of small particles called atoms
12. energy Energy from the sun’s rays. Solar panels can turn solar energy into electricity
15. fuels Materials that are extracted from the earth, such as coal, oil, or natural gas, that are deposited and created over millions of years. We use chemical energy from these fuels for a variety of purposes.
18. To use carefully, to avoid waste