Formation of the Earth Timeline
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Questions and Answers

What type of atmosphere surrounded the early Earth?

  • Nitrogen and ammonia
  • Methane and CO2 (correct)
  • Methane and oxygen
  • Oxygen and nitrogen

    • When did the Earth cool and condense water into oceans?

  • Around 3.5 billion years ago
  • Around 4.2 billion years ago (correct)
  • Around 4.6 billion years ago
  • Around 4 billion years ago

    • What type of isotopes are mostly found in natural stable carbon isotopes?

  • $^{13}C$ (13C)
  • $^{14}C$ (14C)
  • $^{15}C$ (15C)
  • $^{12}C$ (12C) (correct)

    • What does an enrichment of $^{12}C$ in rock suggest?

    <p>It was derived from microorganisms</p> Signup and view all the answers

    What are Stromatolites produced by according to the given text?

    <p>Mat-building communities of mucilage-secreting microorganisms</p> Signup and view all the answers

    What is the main belief of the Panspermia theory?

    <p>Life arose elsewhere in the universe and seeded the Earth</p> Signup and view all the answers

    What did the prebiotic soup hypothesis propose?

    <p>Organic molecules formed from simple precursors in prebiotic oceans</p> Signup and view all the answers

    What was Montmorillonite clay's role in the formation of polymers?

    <p>$^{12}C$ enrichment</p> Signup and view all the answers

    According to Miller-Urey experiments, what organic molecules were formed?

    <p>'Amino acids'</p> Signup and view all the answers

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