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earth science week 1 oceans pollution 1 water 1 water quality 1 watershed 1
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A watershed is an area or ridge of land that separates waters flowing to different rivers, basins, or seas. Watersheds are studied for their contribution to the health of local water systems; many pollutants from the land make their way into the rivers and streams, exiting into the ocean. This...
Grade Level   9 10 11 12
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