Which of These Statements About Earth Is True

question 63

Multiple Choice

Which of these statements about Earth is true?

• A) The oxygen in Earth's atmosphere was created by the evaporation of seawater and its dissociation into hydrogen and oxygen by solar UV light.
• B) Earth has always had an oxygen-rich atmosphere, which was one reason that life could develop on Earth.
• C) Outgassing by volcanic eruptions converted the carbon dioxide-rich atmosphere into an oxygen-rich atmosphere, thus creating conditions in which life could develop.
• D) Life developed in a carbon dioxide-rich atmosphere and then converted it into an oxygen-rich atmosphere.

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