conservation - act of using a resource wisely, ecosystem - specific area where living and nonliving things interact, EPA - Environmental Protection Agency, glaciers - huge amounts of ice on land, groundwater - water that is stored in the soil and rocks underground, water that is stored in the soil and rocks underground - soil that stays frozen most of the time, pollutant - substances that can harm the water, runoff - chemical, soil or other substances that are washed into a body of water,

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