Environmental

Radon gas in a New York home enters primarily through:

ARoof ventilation
BCracks in foundations and floors, from uranium decay in soil and rock✓ Correct
CWater supply from municipal systems
DOld paint on walls

Explanation

Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and rock. It enters homes primarily through cracks, gaps, and openings in foundations and floors.

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