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________ is a colorless and odorless radioactive gas that is forms naturally by certain underground rocks 1. Sewage 2. Sediment 3. Leachate 4. Radon
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________ is a colorless and odorless radioactive gas that is forms naturally by certain underground rocks 1. Sewage 2. Sediment 3. Leachate 4. Radon

User Avmohan
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The answer is #4. Radon.
User Thai Nguyen Hung
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