bri3tcheneybitta bri3tcheneybitta

16-07-2016
Geography

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

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jadecarlson13 jadecarlson13

22-07-2016

B. Radon is the answer....i just took the test

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Аноним Аноним

24-07-2016

B. Radon

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

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