Mid-Ocean Ridge and Sea Floor Spreading Quiz
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Questions and Answers

What technology revealed the existence of an underwater mountain range?

  • Early submarines
  • World War I
  • Echo-sounding devices (correct)
  • Mid-Ocean Ridge
  • What did the discovery of the Mid-Ocean Ridge allow scientists to understand?

  • Underwater ecosystems
  • Atmospheric pressure changes
  • Ocean currents and tides
  • Sea floor spreading and polar reversal (correct)
  • What was the initial opinion of many scientists about the ocean floor before the discovery of the Mid-Ocean Ridge?

  • Rich in marine life
  • Relatively flat with few distinct features (correct)
  • Highly volcanic and active
  • Underwater mountain range
  • What did the peculiar magnetic readings from the ocean floor lead scientists to detect?

    <p>Normal and reversed polarity</p> Signup and view all the answers

    What new technology, introduced during World War I, helped in exploring the tremendous depths of the oceans?

    <p>Echo-sounding devices</p> Signup and view all the answers

    What did the ocean exploration in the middle of the 20th century lead scientists to detect?

    <p>Peculiar magnetic readings from the ocean floor</p> Signup and view all the answers

    What did the discovery of an underwater mountain range hold clues to unlocking?

    <p>Sea floor spreading and polar reversal</p> Signup and view all the answers

    What is the main component of the ocean floor according to the text?

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

    Why was the discovery of stripes of rock with different polarities on the ocean floor surprising?

    <p>Because it raised questions about the cause of the magnetic variation.</p> Signup and view all the answers

    What did scientists notice about the stripes of ocean floor closest to the mid-ocean ridge?

    <p>They all had normal polarity.</p> Signup and view all the answers

    What led scientists to hypothesize about the cause of polar reversal phenomenon?

    <p>The discovery of alternating stripes on the ocean floor.</p> Signup and view all the answers

    What process explains the creation of new oceanic crust due to the upwelling of magma?

    <p>Seafloor spreading</p> Signup and view all the answers

    Why do older stripes of rocks on the ocean floor show polarities that alternate between normal and reversed?

    <p>As a result of flip-flopping of the earth's magnetic field over time.</p> Signup and view all the answers

    What is the significance of new magma solidifying into rock on the ocean floor?

    <p>It records the earth's magnetic orientation at the time.</p> Signup and view all the answers

    What was a key factor that led scientists to understand polar reversal phenomenon?

    <p>The pattern of alternating stripes leading away from the mid-ocean ridge.</p> Signup and view all the answers

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