Plate Tectonics: An Overview
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Questions and Answers

What was the initial uncertainty about the formation of the underwater ridge system?

  • The age of the rocks found at the ridge
  • Whether the ridge was a tectonic plate boundary (correct)
  • The thickness of sediment near the ridge
  • Whether the ridge was caused by volcanic activity

    • What did the thin layers of sediment near the ridge crest and thicker sediment farther away indicate?

  • Increased erosion farther from the crest
  • Volcanic activity near the crest
  • Lack of sedimentation near the crest
  • Different time periods of existence (correct)

    • What did the samples taken from the ridge system reveal about the age of rocks near and away from the crest?

  • Rocks near the crest were very old, getting younger farther away
  • Uniform age of rocks across the ridge system
  • Age of rocks did not correlate with distance from the crest
  • Rocks near the crest were very young, getting older farther away (correct)

    • What did the theory of seafloor spreading propose?

    <p>New oceanic crust is constantly formed due to upwelling magma through diverging tectonic plates</p> Signup and view all the answers

    What did the evidence from drilling samples provide strong support for?

    <p>The theory of plate tectonics and moving tectonic plates</p> Signup and view all the answers

    What is plate tectonics?

    <p>The theory that the earth's crust is broken up into plates</p> Signup and view all the answers

    What was the purpose of the Deep Sea Drilling Project (DSDP)?

    <p>To analyze the ocean floor by drilling core samples</p> Signup and view all the answers

    What was the name of the ship used for the Deep Sea Drilling Project (DSDP)?

    <p>Glomar Challenger</p> Signup and view all the answers

    What important feature is found on the Atlantic Ocean basin?

    <p>Mid-Atlantic Ridge</p> Signup and view all the answers

    What did the Deep Sea Drilling Project (DSDP) aim to extract from the ocean floor?

    <p>Samples of ocean sediments and underlying oceanic crust</p> Signup and view all the answers

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