Approximately How Long After the Solar System Formed Did It

question 15

Multiple Choice

Approximately how long after the Solar System formed did it take for oxygen to get to within 80 percent of its present abundance in the Earth's atmosphere?

• A) 4 billion years
• B) 1 billion years
• C) 400 million years
• D) 1 million years
• E) Oxygen was always a primary component of the Earth's atmosphere.

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