People and the Environment

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