Plate Tectonics: The Earth's Puzzle
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Questions and Answers

What is the primary theory that explains the large-scale changes on the Earth's surface?

  • Erosion and weathering
  • Mantle convection
  • Continental drift
  • Plate tectonics (correct)
  • What is the layer of the Earth that the plates ride along on?

  • Asthenosphere (correct)
  • Crust
  • Inner core
  • Outer core
  • What is the main theory behind plate movement?

  • The rotation of the earth on its axis
  • The gravitational pull of the moon
  • The radioactive decay of uranium and other elements (correct)
  • The chemical reactions in the lithosphere
  • How do the thicknesses of continental and oceanic plates typically differ?

    <p>The thickness of plates depends on the type of crust and location</p> Signup and view all the answers

    Which layer of the Earth is mainly made up of oxygen, silicon, magnesium, and iron?

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

    What was the primary mystery that the theory of plate tectonics helped solve?

    <p>The drifting of continents</p> Signup and view all the answers

    What process is responsible for the movement of plates from the mantle's convection currents encountering the thin crust?

    <p>Ridge push</p> Signup and view all the answers

    What type of crust is typically thinner than continental crust?

    <p>Oceanic crust</p> Signup and view all the answers

    Why does oceanic crust easily slide under another plate back into the mantle?

    <p>Due to its high density</p> Signup and view all the answers

    When was the theory of plate tectonics first proposed?

    <p>In the mid-20th century</p> Signup and view all the answers

    What causes plates to move as they ride on the mantle according to the text?

    <p>Convection cells in the mantle</p> Signup and view all the answers

    What is the primary function of the asthenosphere in the context of plate tectonics?

    <p>It provides the energy to drive plate movement</p> Signup and view all the answers

    Which event marks the location where one plate is sliding under another in converging boundaries?

    <p>Deep ocean trenches</p> Signup and view all the answers

    What type of current is responsible for moving plates due to differences in rock temperature within the Earth?

    <p>Convection current</p> Signup and view all the answers

    What causes plates at spreading centers to flow downhill and eventually flatten out to the ocean floor?

    <p>Ridge push</p> Signup and view all the answers

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