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Which gas is a source of natural groundwater pollution?

A. Oxygen
B. Radon
C. Hydrogen
D. Carbon

i think its a

  • science -

    Oxygen is a polluter? I don't think so!

  • science -

    Which gas is a source of natural groundwater pollution?

    A. Hydrogen
    B. Oxygen
    C. Carbon
    D. Radon

  • science -

    Which of the following is not a type of mass movement that results from the force of gravity?

    A. Deflation
    B. Creep
    C. Mudflow
    D. Landslide

  • science -

    the answer is D. Carbon

  • science -

    well its not D. for sure cuz I took the Penn Foster test and it was wrong.

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