Water on Earth
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Questions and Answers

Which of the following is the most widely supported hypothesis for the origin of Earth's water?

  • Water was formed through volcanic activity
  • Water was delivered to Earth by asteroids (correct)
  • Water was created through chemical reactions on Earth
  • Water was brought to Earth by comets

    • What evidence supports the hypothesis that asteroids are the source of Earth's water?

  • The ratio of hydrogen isotopes in meteorites matching that of Earth's oceans (correct)
  • The collision of large meteorites with Earth
  • The presence of water in asteroids
  • The cool temperatures on Earth's surface

    • How often do large meteorites collide with Earth?

  • Once every 10 million years
  • Once every 1 million years
  • Once every 20 million years (correct)
  • Once every 5 million years

    • Why was the water delivered by asteroids retained on Earth's surface?

    <p>The water condensed into liquid due to cool temperatures</p> Signup and view all the answers

    What is the age of the meteorites containing water that support the hypothesis of asteroid delivery?

    <p>4.5 billion years old</p> Signup and view all the answers

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