Across
- 5. extracting oil or minerals from the ground
- 6. a minerals ability to split easily along flat surface
- 7. urban areas that heat up more quickly and retain heat better than non urban areas
- 9. coal, oil, natural gas, and other fuels that are ancient remains of plants and animals
- 11. a spontaneous process in which unstable nuclei lose energy by emitting radiation
- 13. any natural resource (as wood or solar energy) that can be replenished naturally with the passage of time
- 15. power derived from the wind(as by windmills)
- 16. a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
- 17. polyculture, crop rotation, labor intensive
- 19. a liquid mixture of complex hydrocarbon compound; used widely as a fuel source
- 20. involves global management of earths natural resources to ensure that current and future energy needs will be met without harming the environment
Down
- 1. movement of people from rural areas to cities
- 2. a resource that cannot be reused or replaced easily
- 3. the act of drilling a hole in the earth in the hope of producing petroleum
- 4. the act of cutting down trees, can cause erosion
- 8. agriculture that has minimal/no impact on the land. it is often thought that these foods are healthier or safer in some ways
- 10. the color of a material in powdered form
- 12. Farming
- 14. energy from the sun
- 18. brownish-black materials produced by partial decompostion of plant remains