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23-08-2015
Physics

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Which gas is a source of natural groundwater pollution?
a. Radon
b. Carbon
c. Oxygen
d. Hydrogen

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Аноним Аноним

23-08-2015

It is A) Radon Gas! :D

Radon gas is a contaminated stock of the oxidation of spontaneously befalling uranium within the Earth's shell.

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