Across
- 1. rock solid unweathered rock lying beneath surface deposits of soil
- 6. Density-__________factors environmental factors like disease, parasites, and lack of food, that affect population growth
- 7. A gas mixture of methane and carbon dioxide produced by bacterial degradation of organic matter and used as a fuel.
- 11. resources natural resources that it is possible to use indefinitely without causing reduction in the available supply
- 13. fuels energy sources that formed over geologic time as a result of the compression and partial decomposition of plants and other organic matter
- 14. a plant material that is compressed by the weight of water and by other sediments that accumulate above it turning it into a light, spongy material
- 16. A mixture of gravel, sand, and crushed stone that naturally accumulates on or close to Earth's surface.
- 18. resources resources that exists in a fixed amount in various places in Earth's crust and can only be replaced by processes that take hundreds of millions of years
- 21. the process whereby productive land becomes desert
- 23. the planting of one species in a field
- 24. the restoring of land to its original contours and the replanting of vegetation
- 26. substances that can adversely affect the survival, health, or activities of organisms
- 27. energy Involves global management of Earth's natural resources to ensure that current and future energy needs will be met without causing environmental damage.
- 28. yield replaced through natural processes at the same rate as it's being used
- 29. efficiency the use of energy resources in the ways that are most productive
- 30. production of two usable forms of energy at the same time from the same process, which can conserve resources and generate income.
Down
- 2. growth a pattern of growth in which population grows faster as it increases in size.
- 3. a wide variety of different species (plants and/or animals)
- 4. minerals left after an ore is extracted that may release harmful chemicals into ground water or surface water
- 5. energy Energy produced by naturally occurring steam and hot water
- 8. Density - __________ factors environmental factors like storms, droughts, floods and pollution, that affect population growth
- 9. a natural resource that can be mined for a profit
- 10. the use of organisms to clean up toxic wastes
- 12. pollution occurs when pollutants in air are at quantities that become harmful to the health of humans and the environment.
- 15. capacity the number of organisms that any given environment can support
- 17. a gasoline and ethanol mixture used in conventional gasoline engines
- 19. removal of trees from a forested area without adequate replanting
- 20. resources materials or substances that the Earth provides
- 22. __________cell Thin, transparent wafers made up of layers of boron- and phosphorus-enriched silicon that when exposed to sunlight produce an electrical current.
- 25. process of removing salt from salt water through distillation