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Across 2. Mixture of fresh and salt water. (2 words) 5. The process by which plants convert sunlight into living tissue using carbon dioxide, water, and nutrients. 6. organisms that break down dead organic matter. 7. The addition of a substance to an environment in greater than natural concentrations as a result of human activity producing a detrimental effect on the environment. 8. An inorganic nutrient essential for plant growth and reproduction; excess can cause eutrophication; problems usually associated with farmland runoff, sewage and detergents 9. The sequence in which energy as food is transferred from one group of organisms to another. (2 words) 12. Pollution from a definable source, such as an outfall pipe. (3 words) 16. Pollutants entering waterways from a general area such as runoff. (4 words) 17. Particles which accumulate on the bottom of a waterway. 19. Soil preparation and planting are done in one operation. With this there is limited soil disturbance and most of the crop residue is left on the surface. (3 words) 22. Streams and rivers that supply a larger body of water. 23. The animal form of plankton 24. An interactive system of a biological community and its non-living environment. 26. Farming techniques that are most likely to keep nutrients and soil on the land and that are consistent with economically viable agriculture. (3 words) 29. Screening or settling large solids out of sewage. (3 words) 30. The measurement of the acidity or alkalinity of a material. 31. Preparing the field in the traditional manner by plowing followed by discing. (2 words) 33. Oxygen that is released into the water by photosynthesis and air-water interactions. (2 words) 34. Chemicals, including nitrogen and phosphorous, that are necessary for organisms to live. 37. Rooted vegetation which grows beneath the water surface. (3 words) 41. Low, wet, grassland without trees. 42. Free swimming aquatic organisms such as fish. 44. Over-enrichment of a body of water due to excess nutrient loading, often resulting in lower dissolved oxygen 45. Constructed grass ridges across the slope that redirect runoff to areas where it can reduce potential erosion

Down 1. The area of land that drains to a body of water. 3. Fish that migrate from their primary habitat in freshwater to the ocean to spawn. Ex. American Eel (2 words) 4. Plants and animals living in or on the bottom in aquatic environments. (2 words) 5. The plant form of plankton. 10. Group of primitive, non-flowering plants which include certain seaweeds and phytoplankton. 11. The wearing away of land surfaces by wind or water. 13. Removal of organic material in sewage by aeration and bacterial action. (3 words) 14. Semi-enclosed, tidal, coastal body of water open to the sea in which fresh and salt water mix. 15. An inorganic nutrient essential for plant growth and reproduction when n oxidized forms (nitrate, nitrite, ammonia); problems usually associated with farmland runoff, car exhaust, and sewage. 17. The measurement of the amount of dissolved salts in water, usually measured in parts per thousand. Saltwater =35ppt, freshwater=0ppt. 18. The study of interrelationships of living things to one another and to their environment. 20. Removal of nutrients and traces of toxic organic material from sewage by additional treatment processes including chemicals. (3 words) 21. a conservation farming technique that demonstrates bands of different crops. (3 words) 25. Fish that migrate from their primary habitat in the ocean to freshwater for spawning. ex. American Shad. (2 words) 27. Sod channel that provides a non-erosive outlet for surface runoff. (2 words) 28. Planting fields across the slope to reduce the erosion potential. (2 words) 30. Passively drifting or weakly swimming organisms living suspended in the water column. 32. Sod or natural vegetation strips at the base of a slope or drainage area. These help remove soil particles and nutrients from run-off as it leaves the field. (2 words) 33. Decomposed or partly decomposed plant and animal matter. 35. Vegetation established after harvesting. These decrease nutrient loss and reduce erosion. (2 words) 36. The measurement of water cloudiness. 38. Shrimp-like crustaceans; often they are the most common zooplankton in estuarine waters. 39. The place where a plant or animal lives. 40. Complex interaction of food chains in a biological community. (2 words) 43. The rising and falling of a body of water due to the gravitational pull of the sun and moon.