Environmental

Naturally occurring radioactive material (NORM) in South Dakota soils and rock primarily poses a risk through:

ADirect skin contact with soil
BRadon gas generated by uranium decay that accumulates in buildings✓ Correct
CContamination of surface water supplies
DElectromagnetic radiation from buried uranium deposits

Explanation

Uranium in South Dakota soils decays to produce radon gas, which seeps into buildings through foundations and accumulates. Radon is the second leading cause of lung cancer after cigarette smoking.

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