Across
- 2. (2 words, no space) The amount of work produced compared to the amount of energy used.
- 4. A natural resource that can be mined for profit.
- 6. Materials that are consumed to produce energy.
- 7. A _________ resource is a natural resource that can be replaced by nature in a short period of time.
- 9. Resources that the Earth provides are called _______ resources.
- 11. Nuclear _______ is the process in which heavy nuclei are broken down to create a large amount of energy.
- 12. The removal of trees from a forested area without replanting enough to replace it.
- 15. (2 words, no space) The number of organisms that any given environment can support.
- 17. The use of organisms to clean up or break down toxic waste.
- 18. A ____________ cell is a structure made of silicon that converts solar energy into electricity.
- 19. When renewable resources are replaced at the same rate at which they're being used, it's called ___________ yield.
- 22. A substance that enters Earth's geochemical cycles and can harm the well-being of living things.
- 23. ______ fuels are energy sources that formed over geologic time as a result of the compression and decomposition of organic matter.
- 25. _______ fuels are fuels derived from living things.
- 26. (2 words, no space) Water pollution that originates from widespread areas (like a whole city).
- 28. Environmental factors that do not depend on population size (like storms and fires) are "density-___________ factors".
- 31. _____________ power is power generated by converting the energy of moving/falling water into electricity.
- 33. Chemicals applied to farm fields to control weeds, insects, and fungi.
- 34. A ____________ resource is a resource that exists in a fixed amount and an only be replaced by processes that take millions of years.
- 35. Molecules (chemicals) with only hydrogen and carbon bonds, which are found in plant materials (which is why they burn easily).
- 36. Nitrogen-______ bacteria are bacteria that can capture nitrogen from the air and convert it into a more useful form.
- 37. Plant material compressed by water and sediment, which is highly flammable and can become coal if further compressed.
- 38. "___________ growth" is a pattern of growth where a population grows faster as it increases in size.
Down
- 1. __________ energy is energy produced by naturally-occurring heat/steam/hot water.
- 3. The process where "productive land" (where farming could occur) turns into a desert.
- 5. The process of taking land used for mining, and returning it to its original shape and replanting vegetation.
- 8. The material left after ore is extracted, which might release toxic elements into groundwater.
- 10. Solid, unweathered rock found below layers of soil and aggregate.
- 13. (2 words, no space) A yellow-brown haze that forms mainly from automobile exhaust in the presense of sunlight.
- 14. (2 words, no space) Water pollution that originates from a single point of origin, such as a sewage treatment plant or industrial site.
- 16. Sand, gravel, and crushed stone that naturally accumulate on or near the Earth's surface.
- 20. (2 words, no space) An extremely thin area of the ozone layer.
- 21. The process of removing salt from seawater to produce fresh water.
- 24. (2 words, no space) This involves the global management of Earth's natural resources to meet current and future energy needs.
- 27. ________ bonds are a chemical attraction that forms between water molecules. They're responsible for many of the properties of water.
- 29. Environmental factors that depend on population size (like disease and predators) are "density-_________ factors".
- 30. (2 words, no space) Precipitation like rain, snow, fog, or mist, with a pH of less than 5.0 (which means it's highly acidic).
- 32. The simultaneous (at the same time) production of two usable forms of energy.