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Across 7. contaminants in the air, water or soil that causes that cause harm to human health or the environment 8. pollution that comes from one source that can be identified 11. the interacting system of a biological community and its non-living environment; also the place where these interactions occur 12. raw materials supplied by the earth and its processes 15. water (originating as precipitation) that flows across surfaces rather than soaking in; eventually enters the water; may pick up and carry a variety of pollutants. 17. a line where a body of water and land meet 18. a partly enclosed body of water where salt and freshwater meet and mix 19. an estuarine habitat that is submerged at hi tide, but protected from direct wave action and overgrown by saltmarsh herbaceous vegetation; aquatic grasslands affected by tides temperatures and salinity 20. areas that periodically have waterlogged soils or are covered with a shallow layer of water; resulting in reduced soil conditions Wetland areas typically support plant life adapted to wet environments. 22. the number of different varieties of life forms in a given area 23. The amount of salt dissolved in water.

Down 1. the cleaning deepening or widening of a waterway using a machine (dredge) that removes materials with a scoop or suction device 2. the wearing away of the earth’s surface by running water, wind, ice, or other geological agents 3. essential chemicals needed by plants for growth 4. pollution that comes from many diffuse sources 5. living or growing in or on water 6. a wide bay formed by a bend or a curve in the shoreline 9. wise use and protection from depletion and pollution 10. process whereby excess nutrients stimulate plant and algae growth which in turn can lead to hypoxia 13. the place or type of site where a plant or animal naturally or normally lives and grows 14. A wetland without trees often having standing water 16. microscopic disease causing organisms such as bacteria and viruses that are found in untreated human sewage and animal waste. 21. the alternate rising and falling of the surface of the ocean and of water bodies connected with the ocean, which occurs twice a day and is caused by the gravitational attraction of the sun and moon occurring unequally on different parts of the earth