natural resources

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Across
  1. 2. aprocess by which plants prepare food
  2. 3. agreen house gas
  3. 5. where ozone is present in atmosphere
  4. 7. organism which can grow on stone and form soil
  5. 8. constituent of top soil
Down
  1. 1. felling oftrees
  2. 4. one form of oxygen in the atmosphere
  3. 6. anitrogen fixing bacteria in root nodules of legumes