Environment

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Across
  1. 3. a layer of gases in the sky that prevents harmful radiation from the sun from reaching the Earth
  2. 4. rain that contains harmful acid which can damage the environment and is caused by chemicals in the air, for example from cars or factories
  3. 6. the gradual warming of the air surrounding the Earth
  4. 7. a general increase in world temperatures caused by increased amounts of carbon dioxide around the Earth
Down
  1. 1. the process of making air, water, soil etc dangerously dirty and not suitable for people to use
  2. 2. the air, water, and land in which people, animals, and plants live
  3. 5. the cutting or burning down of all the trees in an area