Environmental

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

AThrough the water supply
BThrough gaps and cracks in the foundation from soil beneath the building✓ Correct
CFrom older building materials such as asbestos
DFrom electromagnetic fields in the area

Explanation

Radon is a colorless, odorless gas produced by the natural decay of uranium in soil and rock. It enters buildings primarily through cracks and gaps in the foundation from the soil below.

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