An underground rock formation that contains water

Introduction of inorganic plant nutrients into a body of water

Accumulation of larger and larger amounts of toxins within tissues of organisms at each succesive trophic level

Process in which salt is removed from water

Water that seeps down through the soil and is stored underground

Pollution discharged from a single source

Area on earth where ground water orginates

Fresh water found above ground in lakes

Entire area of land that drains into a river

Introduction of foreign substances into water that degrade it's quality

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