Across
- 3. an area or ridge of land that separates waters flowing to different rivers, basins, or seas
- 4. land consisting of marshes or swamps; saturated land
- 7. a river and all its branches
- 9. barrier constructed to hold back water and raise its level
- 11. excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen
- 14. a hydrologic process where water moves downward from surface water to groundwater
- 15. the top layer of a body of water
- 16. the small and microscopic organisms drifting or floating in the sea or fresh water
- 17. a body of permeable rock that can contain or transmit groundwater
- 18. the flora and fauna found on the bottom, or in the bottom sediments, of a sea, lake, or other body of water
- 21. water held underground in the soil or in pores and crevices in rock
- 22. the state or quality of a material or membrane that causes it to allow liquids or gases to pass through it
Down
- 1. the ecological region at the lowest level of a body of water
- 2. a ridge of rock in the sea formed by the growth and deposit of coral
- 5. an area of coastal grassland that is regularly flooded by seawater
- 6. long broad sandy island lying parallel to a shore that is built up by the action of waves, currents, and winds and that protects the shore from the effects of the ocean
- 8. safe to drink
- 10. a coastal marine swamp of tropical or subtropical regions that is dominated by mangrove trees
- 12. the part of the ocean closest to the shore
- 13. a measure of how much of a rock is open space
- 19. the tidal mouth of a large river, where the tide meets the stream
- 20. aquatic animals that are able to swim and move independently of water currents