Geography

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Across
  1. 2. a populated city
  2. 4. convert (waste) into reusable material.
  3. 6. is the ability to be maintained at a certain rate or level.
Down
  1. 1. the strength and vitality required for sustained physical or mental activity.
  2. 3. small populated place
  3. 5. a nation with its own government
  4. 7. are a large naturally occurring community of flora and fauna occupying a major habitat