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Which gas is a source of natural groundwater pollution ? A. Hydrogen B. Radon C. Carbon D. Oxygen

User LeoRochael
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B. Radon is the answer....i just took the test
User Sajjan Singh
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B. Radon

Due to a stock of befalling uranium at the earth's shell, radon gas is formed causing natural pollution in the groundwater.
User Per Arneng
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