What Is the MOST Significant Fact About the Oxygen in Earth's

question 287

Multiple Choice

What is the MOST significant fact about the oxygen in Earth's atmosphere?

• A) Oxygen is the most abundant gas in Earth's atmosphere.
• B) Oxygen is very chemically reactive.
• C) The oxygen in Earth's atmosphere exists not as pure oxygen, but only in chemical combination with hydrogen in water, carbon in carbon dioxide, and nitrogen in nitrogen oxides.
• D) Oxygen is the heaviest molecule in Earth's atmosphere.

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