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Across 1. the removal of a sediment from the bottom of asea or river 4. salt water ecosystem and organisms 6. the ability to survive 7. measurement of how acidic or basic a substance is 11. organisms that float in the water and drift with the currents 12. water held beneath the earths surface 16. property of bieng acidic, substances with ph values from 0-6 17. an underground reef that is man-made (2 Words) 18. usually as a result of human activity (trash, plastic, cans,etc.) 19. an underground treatment system for household sewage (2 Words) 20. the falling to earth of any form of water

Down 2. pollution that cannot be traced to a specific source (3 Words) 3. anything capableof causing disease 5. propertty of bieng a base substances with ph values from 8-14 8. an area of land where all of the water drains into the same body water 9. capable of cauising injury or death, especially by chemical means 10. substance that pollutes an enviroment 13. an area of land that allows water to replenish an aquifer (2 Words) 14. water that is above the earths surface (2 Words) 15. a stream that flows to a larger stream or other body of water