Across
- 3. any natural resource that can be reused or replaced naturally over time - regenerate as fast as they are used
- 6. fuel that comes from plants and animals
- 7. coal, oil, natural gas, and other fuels that are ancient remains of plants and animals
- 8. Trying to use less energy or to use energy more efficiently
- 10. a natural fuel such as coal or gas, formed from the remains of organisms that lived millions of years ago
- 12. the result or effect of an action
- 15. energy obtained from flowing water by constructing a dam and using a turbine
- 17. largest number of individuals of a given species that Earth's resources can support and maintain for a long period of time
- 20. any natural resource that cannot be reused or replaced easily
- 21. a gas with high methane content, found along with various fossil fuels and is used as a fuel
- 22. energy obtained from the wind by means of windmills
Down
- 1. energy stored in the nucleus of an atom
- 2. natural situation in which heat is retained in Earth's atmosphere by carbon dioxide, methane, water vapor, and other gases
- 4. resources provided by Earth, including air, water, land, all living organisms, nutrients, rocks and minerals
- 5. all the members of a species living in a given area
- 9. energy obtained from the sun by means of solar panels
- 11. fuel made from plants or algae - a form of renewable energy
- 13. a slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles
- 14. energy obtained from the heat in the interior of the earth
- 16. the long-term average weather condition over a large area
- 18. day to day change in the atmosphere's condition locally
- 19. gases in the atmosphere that trap energy