Biospheres

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Across
  1. 3. fuels a natural fuel such as coal or gas
  2. 5. the totality of our sorroundings
  3. 7. cycle the naturally occurring processes in which carbon is exchanged
  4. 10. warming the gradual rise in average temperatures in the atmosphere
  5. 11. the variety of all life forms
  6. 12. the inability to meet the basic needs of living
Down
  1. 1. the release of any hazardous or potentially hazardous substance into the environment
  2. 2. the expansion of deserts due to overgrazing, soil erosion etc.
  3. 4. the accumulation of substances such as pesticides in an organism
  4. 5. the relationship between living things and their physical environment
  5. 6. degradation the downgrading of the productive capacity of land due to the activites of people
  6. 8. the physical environment in which a community of plants and animals lives
  7. 9. a species of animal or plant that no longer exist
  8. 10. effect the atmospheric processes that maintain an average surface temperature of 15 degrees