Where does radon come from?

Radon comes from the soil. Radon is produced from the natural decay of uranium that is found in nearly all soils. Uranium breaks down to radium. As radium disintegrates it turns into radioactive gas: radon. As a gas, radon moves up through the soil and into the air you breathe.

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1. Where does radon come from?
2. How dangerous is radon?
3. How serious a problem is radon in Minnesota?
4. How does radon enter a home?