Chapter 24

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Across
  1. 2. The careful use and protection of water resources.
  2. 4. Contamination of water by harmful substances.
  3. 8. An area of land that drains into a particular river, lake, or other body of water.
  4. 9. The process of removing salt from seawater to produce freshwater.
  5. 10. Liquid fossil fuel commonly called crude oil.
  6. 12. Any material or substance that occurs in nature and can be used by humans.
  7. 13. A region of the stratosphere containing high concentrations of ozone that absorbs harmful ultraviolet radiation.
  8. 14. The layer of gases surrounding Earth.
  9. 16. Energy-rich substances formed from the remains of ancient organisms.
  10. 19. An underground layer of permeable rock or sediment that stores and transmits groundwater.
  11. 22. Energy derived from heat within Earth.
  12. 25. Water that contains very low concentrations of dissolved salts.
  13. 27. The process by which water is added back into an aquifer.
  14. 29. A mineral containing metals that can be extracted and used.
  15. 33. A gaseous fossil fuel composed mainly of methane.
  16. 34. Water that has been used and contains dissolved or suspended wastes.
  17. 35. A mixture of pollutants that forms a haze in the atmosphere.
  18. 36. The most abundant gas in Earth's atmosphere.
  19. 37. Rain, snow, or other precipitation made acidic by air pollutants.
  20. 38. A fossil fuel formed from ancient plant remains.
  21. 39. Planning and controlling the use of natural resources to ensure their availability in the future.
  22. 40. Water containing high concentrations of dissolved salts.
Down
  1. 1. Contamination of the atmosphere by harmful substances.
  2. 3. Water located beneath Earth's surface in soil and rock.
  3. 5. Energy generated by moving air.
  4. 6. The amount of a renewable resource that can be used without reducing its availability in the future.
  5. 7. A mineral that does not contain metals and is used for various industrial purposes.
  6. 11. The upper surface of the zone of saturation.
  7. 15. Water found on Earth's surface, such as rivers, lakes, and streams.
  8. 17. A gas essential for most living organisms and combustion.
  9. 18. A mineral or rock containing enough valuable substances to be mined profitably.
  10. 20. The effect that human activities have on the natural environment.
  11. 21. Energy produced by moving water.
  12. 23. A resource that forms much more slowly than it is used and cannot be replaced quickly.
  13. 24. The warming of Earth's atmosphere caused by certain gases trapping heat.
  14. 26. Energy from the Sun.
  15. 28. A resource that can be replenished naturally in a relatively short period of time.
  16. 30. The process of removing minerals and other resources from Earth's crust.
  17. 31. The careful use and management of natural resources.
  18. 32. Energy released from the nucleus of an atom.