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