Chapter 4 Land, Air, and Water Resources

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Across
  1. 1. A long period of low precipitation.
  2. 3. The advance of desert-like conditions into areas that previously were fertile.
  3. 5. The layer of soil below topsoil that has less plant and animal matter than topsoil and contains mostly clay and other minerals.
  4. 6. Polluted liquid produced by water passing through and dissolving chemicals from buried wastes in a landfill.
  5. 9. The process of reclaiming and reusing raw materials.
  6. 10. The process by which water, ice, wind, or gravity moves weathered particles of rock and soil.
  7. 12. A substance that causes pollution.
  8. 13. The layer of the upper atmosphere that contains a higher concentration of ozone than the rest of the atmosphere.
Down
  1. 2. The crumbly, topmost layer of soil made up of clay and other minerals and humus.
  2. 4. Small, solid pieces of material that come from rocks or the remains of organisms.
  3. 7. Pollutants that are released into the air.
  4. 8. The water and human wastes that are washed down sinks, toilets, and showers.
  5. 11. A colorless, odorless, radioactive gas.