Which gas is a source of natural groundwater pollution?
A. Oxygen
B. Radon
C. Hydrogen
D. Carbon
Radon is a source of natural groundwater pollution.
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Asked 10/2/2018 8:28:35 AM
Updated 210 days ago|6/30/2020 11:34:35 PM
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Edited by
Masamune [6/30/2020 11:34:33 PM], Confirmed by
Masamune [6/30/2020 11:34:34 PM]
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