Exploring Atmospheric Methane
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Questions and Answers

What is the current atmospheric methane concentration?

  • 1000 ppm
  • 500 ppm
  • 2000 ppb
  • 1900 ppb (correct)

    • At what concentration does methane have an anti-greenhouse effect?

  • 1900 ppb
  • 500 ppb
  • 1000 ppm (correct)
  • 2000 ppm

    • Which minerals weather rapidly when exposed to oxygen?

  • Uraninite and pyrite (correct)
  • Gypsum and halite
  • Calcite and dolomite
  • Quartz and feldspar

    • In which rock sequences were the observed 2.45 Ga old rock sequences also found?

    <p>Western Australia, South Africa, Fennoscandia</p> Signup and view all the answers

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