Nature

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Across
  1. 1. part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life
  2. 2. lands on which trees are the principal plant life.
  3. 3. branch of science concerned with the interrelationship of organisms and their environment
  4. 4. of or relating to life.
  5. 5. system of collecting, sorting, and reprocessing old material into usable raw materials
  6. 7. interconnected and symbiotic grouping of animals, plants, fungi, and microorganisms
Down
  1. 1. waste material broken down and goes back into ecosystem
  2. 6. petroleum fuel, used to power cars, trucks, lawn mowers, etc
  3. 8. dense, discolored radiation fog containing pollutants