The answer is c. 1970.
The Clean Water Act came into force in the decade 1970s. The act is to regulate the discharges of pollutants into the waters and to regulate quality of surface water. The clean water act required industries to reduce or eliminate point source pollution in surface waters.
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Spatial relationships can also refer to any sort of interaction between two locations, whether they be specific locations or regions. For example, a city has a spatial relationship with the surrounding farms or with other cities.
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Read it carefully and slowly
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PRNewswire-USNewswire/ -- Following is the daily "Profile America" ... Today, over 85 percent of the nation's households have a washing machine. ... people, places and economy, from the American Community Survey, ... First fully automatic machine/accessed 7/22/2016: ... Strictly Necessary Cookies.
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