Environmental

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

AContaminated municipal water supplies
BCracks in foundations and floors from underlying soil and rock✓ Correct
CLead paint deterioration in older homes
DAsbestos fibers disturbed during renovation

Explanation

Radon is a colorless, odorless gas produced by the decay of uranium in soil and rock. It enters buildings through cracks in foundations, floors, and walls.

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