Environmental

Radon is a naturally occurring radioactive gas that enters buildings primarily through:

AContaminated water supplies
BCracks and openings in foundations from surrounding soil and rock✓ Correct
COld lead-based paint
DAsbestos insulation

Explanation

Radon is a naturally occurring radioactive gas that rises from soil and rock and enters buildings through cracks and openings in foundations. North Dakota has areas with elevated radon levels.

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