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| The top layer of a body of water |
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| Land drained by a river and its tributaries. |
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| An area of ridge of land that seperates waters flowing to different rivers, basins, or seas. |
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| Water held underground in the soil or in pores and crevices in rocks. |
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| A body of permeable that can contain or transit ground water. |
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| The state or quality of a material or membrane that causes it to allow liquids or gases to pass through it. |
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| Surface area surrounding an aquifer from which water in the form of precipitation or surface waters replensihes the ground water stored in the aquifer. |
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| A bacterium, virus, or other microorganism that can cause disease. |
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| Controlled amount of water is supplied to plants at regular intervals for agriculture. |
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| A barrier constructed to hold back water and rasie its level. |
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| A large natural or artificial lake used as a source of water supply. |
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| Process that removes minerals from saline water. |
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| Any water that has been adversely affected in quality by anthropogenic influence. |
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| Accelerated inorganic plant nutrients, such as phosphorus and nitrogen, enter the water from sewage and fertilizer runoff. |
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| Degradation of water quality by any process that changes ambient water temperature. |
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| The concentration of toxins in an organism as a result of its ingesting other plants or animals in which the texins are more widely disburesed. |
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