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What inference regarding the use of solar photovoltaics can be made from the map below?
NREL (National Renewable Energy Laboratory of the United States Department of Energy) Licensing. "Solar Maps." NREL: Dynamic Map., n.d. Web. 07 Mar. 2016.
There are more urban areas in the Northeast region of the United States.
The midwest land is already taken for agricultural use.
It is too cold in Alaska for photovoltaics to work.
It does not rain in Hawaii.
Regions in the Southwestern U.S. receive receives more hours of sunlight per day throughout the year.