Environmental

Radon is a naturally occurring gas that forms from the decay of:

ACarbon
BUranium and radium in soil and rock✓ Correct
CMethane from landfills
DFormaldehyde in building materials

Explanation

Radon is a naturally occurring radioactive gas produced by the decay of uranium and radium found in soil and rock. It can accumulate in buildings through foundation cracks and gaps. Pennsylvania has among the highest radon levels in the nation.

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