Science Crossword Puzzle

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Across
  1. 3. the presence in or introduction of a harmful or poisonous substance into the environment.
  2. 4. excess water draining away from land or buildings
  3. 5. the various actions for recreation, living, or necessity done by people
  4. 6. a global, interconnected system that has regions, or basins
  5. 8. the water found underground in soil.
  6. 11. the surrounding in which a person, animal, or plant lives or operates.
  7. 12. sudden, natural or man-made, situations where change and destruction occurs
Down
  1. 1. a group of individuals of the same spices living and interbreeding within an area
  2. 2. water located on top of the earths surface
  3. 7. underground layer of water-bearing permeable rock
  4. 9. an area or ridge of land that separates water
  5. 10. a biological community of interacting organisms and their physical environment.