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Across 5. the level of magnesium and calcium in water 6. essential to life, but too much can cause algae and plankton to over produce 11. 1.able to be maintained 12. a lake that stores water for human use 15. an area where ocean water sinks through cracks in the ocean floor, heating the water 16. measure of the average energy of motion of the particles of a substance 17. a land area that is covered with a shallow layer of water 20. combined force of attraction among water molecules and water molecules and another surface 22. the amount of heat needed to increase the temperature of a substance 23. bouyant force of an object is equal to the weight of the fluid displaced 25. the amount of dissolved salt in a water sample 26. a well in which water rises due to pressure within the aquifer 27. organisms that live on the bottom of the ocean 28. the degree of purity in the water 31. the production of light by living things 32. the process by which plants make their own food 35. an area where fresh water and salt water meet 36. a molecule that has electrically charged areas 38. tiny algae that float in water 39. tightness across the surface of a molecule 40. the change in state from a gas to a liquid 41. the process by which particles in a liquid clump together 44. water that falls to Earth as rain, snow, sleet or hail 47. the substance dissolved by the solvent 48. the introduction of harmful substances into the environment 51. the farming of aquatic organisms such as fish, crustaceans, molluscs and aquatic plants 54. the responsible planning and management of resources 56. a continuous range of mountains on the ocean floor 57. the top of the saturated zone 58. water easily passes through 59. removal of salt from water 61. a substance that causes the pollution 62. upward force exerted by a fluid 64. a rapid increase in the population of algae in an aquatic system 65. having the ability to float 68. mass divided volume 69. the source of the pollution is known 71. Nitrate is a compound that is formed naturally when nitrogen combines with oxygen or ozone; souces: fertilizer, soil, human waste 72. a large stream of moving water 73. a deep canyon in the ocean floor 74. the place where an organism lives 75. environmental protection agency

Down 1. makes up 3% of Earth's water 2. filled up; holding as much as possible 3. the land area that supplies water to a river system 4. continuous process by which water moves from Earth's surface - atmosphere - back 7. the measure of how basic or acidic a substance is 8. a ridge of land that separates one watershed from another 9. a gently sloping area that extends outward toward the edge of a continent 10. a solvent that has the ability to dissolve many substances 13. water does not easily pass 14. a steep incline of the ocean floor leading down from the shelf 18. the source of the pollution is not known 19. process by which nutrients in a lake buildup over time causing algae growth 21. the existence of a wide variety of plant and animal species in their natural environments 24. plants give off water vapor through their leaves 26. a smooth nearly flat region of the deep ocean floor 29. movement of cold water upward from the deep ocean 30. the smaller streams that feed into a main river 33. water that fills the cracks and spaces in underground rock layers 34. uses sound to calculate the distance of an object 37. the amount of one material in a certain amount of another material 42. an organism that reveals the presence of the pollutants by the occurrence of measurable symptoms 43. water is attracted to itself 45. temperature and precipitation of an area over a long period of time 46. the substance that does the dissolving 49. a substance that enables plants and algae to grow (phosphate/nitrates) 50. process of passing water through a screen to removal unwanted particles 52. process by which a liquid changes into a gas 53. water is attracted to other substances 55. a mixture where one substance is dissolved into another 60. the clarity of the water 63. an underground layer of rock that holds water 66. feeding relationship in a habitat 67. free swimming organisms that move through the water column 70. object-locating system