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Questions and Answers
What was the primary component of Earth's atmosphere 3.8 billion years ago?
What was the primary component of Earth's atmosphere 3.8 billion years ago?
- Nitrogen
- Methane (correct)
- Free oxygen
- Carbon dioxide
How did the oceans 3.8 billion years ago differ from those of today?
How did the oceans 3.8 billion years ago differ from those of today?
- Oceans were more acidic
- Oceans were less salty
- Oceans were rich in dissolved oxygen (correct)
- Oceans were devoid of dissolved oxygen
What is true about Earth's atmosphere 3.8 billion years ago?
What is true about Earth's atmosphere 3.8 billion years ago?
- It was devoid of oxygen (correct)
- It was similar to the atmosphere of Mars
- It was primarily composed of oxygen
- It was rich in nitrogen
How do the atmosphere and oceans of 3.8 billion years ago compare to those of today?
How do the atmosphere and oceans of 3.8 billion years ago compare to those of today?
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What can be inferred about the oxygen levels in Earth's atmosphere and oceans 3.8 billion years ago?
What can be inferred about the oxygen levels in Earth's atmosphere and oceans 3.8 billion years ago?
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How do stromatolites provide insights into the Earth's early environment?
How do stromatolites provide insights into the Earth's early environment?
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