| http://www.w3.org/ns/prov#value | - the source can not be identified ??? ??? ??? impervious surfaces surface, such as a parking lot, street, or sidewalk that will not allow water to absorb into the ground ??? ??? ??? watershed area of land that drains to one place ??? ??? ??? genetic pollution when an invasive species takes over in an area so that the native species can no longer live ??? ??? ??? thermal pollution water that gets heated
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