Environmental

New Hampshire has some of the highest rates of radon in New England primarily because of:

AIts coastal location
BGranite bedrock containing uranium that decays to radon gas✓ Correct
CIts cold climate preventing radon from dissipating
DIndustrial air pollution

Explanation

NH's granite-rich bedrock contains uranium deposits that naturally decay into radon gas. The gas seeps through soil and foundation cracks, making NH one of the higher-radon states in the country.

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