Earth's Atmosphere
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Questions and Answers

Which gas makes up the majority of Earth's atmosphere?

  • Argon
  • Carbon Dioxide
  • Nitrogen (correct)
  • Oxygen

    • What is the main role of nitrogen-fixing bacteria in the soil?

  • To convert nitrogen into a usable form (correct)
  • To produce oxygen
  • To remove carbon dioxide from the atmosphere
  • To increase the amount of argon in the atmosphere

    • What gas was predominantly present in the Earth's atmosphere during the first billion years?

  • Nitrogen
  • Argon
  • Oxygen
  • Carbon Dioxide (correct)

    • What caused the decrease in atmospheric carbon dioxide and increase in oxygen?

    <p>Photosynthesis by algae and green plants</p> Signup and view all the answers

    What is a barometer used to measure?

    <p>Air pressure</p> Signup and view all the answers

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