People and the Environment

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Across
  1. 2. Way of cleaning the land.
  2. 5. Pollution of the air.
  3. 6. Produced by chemicals in the air.
  4. 7. The loss of rain forests changes the world's air and...
  5. 8. Materials or substances occurring in nature which can be exploited for economic gain.
Down
  1. 1. Many countries are now researching ways to protect it.
  2. 3. An increase in the amount of carbon dioxide and other gases in the atmosphere, that is believed to be the cause of a gradual warming of the surface of the earth.
  3. 4. The process of making air, water, soil, etc dangerously disty and not suitable for people to use.
  4. 6. The practice or science of farming.
  5. 9. It is formed when polluted air mixes with fog.