Across
- 2. the study of the choices people make as they use and distribute limited resources
- 7. energy sources that are stil in development
- 8. the energy within the nucles of an atom
- 10. saving energy
- 12. crumbly materials made from plant and animal matter that is spread on gardens and feilds to enrich soil
- 13. a pond that has a sealed bottom
- 14. the energy from heat in te eath's crust
- 15. liquid that has passed through compacted solid waste in a landfill
- 16. energy producefrommoving waer
- 17. states the needs for a project, its impact on the eviroment and how any negaive effect can be minimized
- 20. any dicarded solid material
- 23. waste produced by household an buisnesses
- 24. the process of reusing materials
- 25. organic matter that is used as an energy source
- 27. oil deposits that can be extracted profitably at current technology
- 28. a permanent waste-disposal facility where waste are put into the ground and covered each day with a layer of soil and plastic
Down
- 1. any waste that i a risk to the health of humans or other living things
- 2. a machine that converts mechanical energy into electrical energy
- 3. gathering of solar energy by colectors that are used to heat water or heat a building
- 4. an organized attempt to influence the decisions of lawmakers
- 5. any change in dsighn, manufacture, purchase or use of materials or products to reduce their amount or toxicity before they become municipal waste
- 6. using the suns energy to heat something directly
- 9. lightweight atomic nuclei combine to form a heavier nucleus and releases large amounts of energy
- 11. collisions that cause the nuclei to split
- 18. wastes get dumped into the ground
- 19. any combustible organic material, as oil, coal, or natural gas, derived from the remains of former life
- 21. oil that is pumped from the ground
- 22. can be broen down by biological processes
- 26. device tht produces electricity chemically by combining hydrogen fuel with oxygen frm the air