Theory of Plate Tectonics
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Questions and Answers

What is the theory that combines continental drift and seafloor spreading?

  • Theory of Earthquakes
  • Theory of Continental Drift
  • Theory of Plate Tectonics (correct)
  • Theory of Seafloor Spreading

    • What makes up the 'plates' in plate tectonics?

  • The Earth's mantle
  • The Earth's crust
  • The Earth's lithosphere (correct)
  • The Earth's core

    • What was the original purpose of setting up seismograph networks in the 1950s and early 1960s?

  • To monitor atomic bomb tests (correct)
  • To study earthquakes
  • To study the Earth's crust
  • To study volcanic eruptions

    • What do the earthquakes and mid-ocean ridges mark on the Earth's surface?

    <p>The edges of the plates</p> Signup and view all the answers

    What is the point on the Earth's surface directly above where an earthquake occurs?

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

    What was the result of plotting all earthquakes from 1963 to 1998 on a map?

    <p>The earthquakes outlined the plates</p> Signup and view all the answers

    What is the lithosphere divided into?

    <p>A dozen major and several minor plates</p> Signup and view all the answers

    What is the rate at which plates move over the Earth's surface?

    <p>A few centimeters a year</p> Signup and view all the answers

    What drives plate tectonics?

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

    What is the term for the movement of the plates over the Earth's surface?

    <p>Plate tectonics</p> Signup and view all the answers

    What occurs at divergent plate boundaries?

    <p>Plates move apart</p> Signup and view all the answers

    What is formed at mid-ocean ridges?

    <p>New ocean crust</p> Signup and view all the answers

    What is the result of convergent plate boundaries?

    <p>Magma generation and earthquakes</p> Signup and view all the answers

    What is the process of a continent breaking apart and forming an ocean?

    <p>Continental rifting</p> Signup and view all the answers

    What is the type of rock formed at mid-ocean ridges?

    <p>Igneous rock</p> Signup and view all the answers

    Where do most geologic activities, including volcanoes, earthquakes, and mountain building, take place?

    <p>At plate boundaries</p> Signup and view all the answers

    What is the result of the Indian Plate colliding with the Eurasian Plate?

    <p>The formation of the Himalayas</p> Signup and view all the answers

    What is the geologic origin of the Appalachian Mountains?

    <p>A convergent plate boundary</p> Signup and view all the answers

    What is the name of the plate boundary that creates the Cascades volcanoes?

    <p>A convergent plate boundary</p> Signup and view all the answers

    What is the name of the famous fault in California that is a transform plate boundary?

    <p>The San Andreas Fault</p> Signup and view all the answers

    What is the geologic origin of the Sierra Nevada?

    <p>Granitic intrusions</p> Signup and view all the answers

    What is the current state of the Pacific Ocean?

    <p>It is shrinking</p> Signup and view all the answers

    What is the supercontinent cycle responsible for?

    <p>Many of the geologic features that we see</p> Signup and view all the answers

    What is the geologic origin of the Cascades Range?

    <p>A convergent plate boundary</p> Signup and view all the answers

    What is the result of the movement of the Pacific Plate and the North American Plate?

    <p>The creation of the San Andreas Fault</p> Signup and view all the answers

    What is the Appalachian Mountains’ current state?

    <p>They have been weathered and eroded significantly</p> Signup and view all the answers

    What phenomenon causes the formation of a line of volcanoes known as a continental arc?

    <p>Subduction of an oceanic plate beneath a continental plate</p> Signup and view all the answers

    In which type of plate boundary do oceanic plates subduct into the mantle?

    <p>Ocean-Ocean plate boundary</p> Signup and view all the answers

    What type of boundary leads to the creation of an island arc?

    <p>Ocean-Ocean boundary</p> Signup and view all the answers

    What type of plate boundary results in some of the world's largest mountain ranges?

    <p>Continent-Continent boundary</p> Signup and view all the answers

    What geological feature is formed when the denser oceanic plate plunges beneath the continental plate?

    <p>Subduction zone</p> Signup and view all the answers

    What is responsible for causing melting in the mantle in the context of plate tectonics?

    <p>Subducting plate</p> Signup and view all the answers

    What is the result of magma being too viscous (thick) to rise through the crust in a continental arc?

    <p>Granite or granodiorite formation</p> Signup and view all the answers

    What type of rock is likely forming beneath the Andes and Cascades today?

    <p>Igneous rock</p> Signup and view all the answers

    What happens to continental material when two continental plates collide?

    <p>Mountain range formation</p> Signup and view all the answers

    What is the significant feature of the Himalayan mountains regarding volcanic activity?

    <p>No volcanoes due to thick crust preventing magma rise</p> Signup and view all the answers

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