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...Freshwater since of earth s is frozen in ice we split the remaining usable into two categories groundwater and surface water found lakes streams rivers while underground aquifers both forms are replenished by cycle through precipitation however runof will feed their tributaries that flow infiltrates drips ground there continued as runoff flows over land it can pick up pollutants other materials negatively affect its quality on hand filtered many layers rock lead to aquifer because saltwater resources so vital living things important maintain keeping them clean general refers cleanliness determine looking at a variety physical chemical factors for example health river system best judged nitrate levels turbidity lake used assessed temperature ph united states environmental protection agency epa responsible regulating natural such air setting limits most common contaminants excessive amounts tem considered dangerous our aspects include how cloudy rate movement even though survive range te...