Environmental

Radon gas enters homes primarily through:

AContaminated municipal water supplies
BCracks and openings in foundations from the soil below✓ Correct
COld lead paint on interior walls
DAsbestos insulation in walls and ceilings

Explanation

Radon is a naturally occurring radioactive gas that forms from the decay of uranium in soil and rock. It enters homes through cracks and gaps in foundations. Radon is the second leading cause of lung cancer in the US.

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