The Evolution of Earth's Atmosphere
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Questions and Answers

What is the current composition of Earth's atmosphere?

  • 80% nitrogen, 20% oxygen (correct)
  • 100% nitrogen
  • 80% oxygen, 20% nitrogen
  • 50% nitrogen, 50% oxygen

    • What played a significant role in creating the early carbon dioxide rich atmosphere?

  • Volcanic activity (correct)
  • Plant activity
  • Animal activity
  • Solar activity

    • What reduced the abundance of CO2 and increased the amount of oxygen in the atmosphere?

  • Solar activity
  • Volcanic activity
  • Animal activity
  • Algae and plant activity (correct)

    • What are the main gases that make up Earth's atmosphere?

    <p>Nitrogen, oxygen, carbon dioxide, water vapor, and noble gases.</p> Signup and view all the answers

    What role did volcanic activity play in creating the early atmosphere?

    <p>Volcanic activity produced carbon dioxide, water vapor, and nitrogen.</p> Signup and view all the answers

    What is the theory regarding the evolution of Earth's atmosphere?

    <p>The theory suggests that volcanic activity created a carbon dioxide rich atmosphere, which was later reduced by algae and plants, increasing the amount of oxygen.</p> Signup and view all the answers

    During the first billion years of Earth's history, the Earth was really dry and there was intense ______ activity

    <p>volcanic</p> Signup and view all the answers

    The early atmosphere consisted of loads of carbon dioxide, water vapor, and ______ along with smaller amounts of methane and ammonia

    <p>nitrogen</p> Signup and view all the answers

    The composition of Earth's atmosphere is approximately eighty percent ______ and twenty percent oxygen

    <p>nitrogen</p> Signup and view all the answers

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