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