geography

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Across
  1. 6. envelope of gases surrounding
  2. 8. variety of plant and animal life
  3. 9. extreme heat events
  4. 11. the needs of the present without compromising
  5. 13. Earth's water, in the ocean
  6. 15. distance of a place north or south
  7. 16. devoid of life
Down
  1. 1. below the Earth's surface
  2. 2. species that live in that location
  3. 3. ecosystem water-based
  4. 4. rocky outer part of Earth
  5. 5. living or once living components
  6. 7. relating to or occupying space
  7. 10. area where living organisms
  8. 12. ecosystem land-based community of organisms
  9. 14. great height
  10. 17. arrangement of the natural and artificial