Earth day

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Across
  1. 2. it prevents harmful ultraviolet light from the sun from reaching the earth
  2. 7. the cutting down of trees in a large area
  3. 8. a mountain with a large circular hole at the top through which lava gases, steam and dust are or have been forced out
  4. 9. the process by which land changes into desert
Down
  1. 1. poisonous gas
  2. 3. harmful chemicals in the air
  3. 4. number and variety of plant and animak species in particular area
  4. 5. damage caused to water, air or soil by harmful substances or waste
  5. 6. to collect and treat rubbish to produce useful materials which can be used again
  6. 10. general weather conditions usually found in a prticular place