banuggMarianama banuggMarianama

24-03-2017
Geography

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_______ is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer.
a. radon
b. carbon monoxide
c. hydrogen
d. nitroge

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Аноним Аноним

24-03-2017

Radon is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer.

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