Virginia's Volcanic History
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Questions and Answers

What is the estimated depth of the magma that bubbled below the Shenandoah Valley?

  • 10 to 20 kilometers
  • 80 to 100 kilometers
  • 40 to 65 kilometers (correct)
  • 120 to 150 kilometers
  • What is the type of rock that Mole Hill and Trimble Knob are primarily composed of?

  • Basal rock
  • Igneous rock (correct)
  • Sedimentary rock
  • Metamorphic rock
  • What are the rocks called that the magma picked up as it rose to the surface?

  • Sedimentary rocks
  • Xenoliths (correct)
  • Igneous rocks
  • Xenolites
  • Approximately how many volcanoes have been identified in Virginia by Johnson?

    <p>100</p> Signup and view all the answers

    What is the reason why humans are fascinated by volcanic activity, according to Johnson?

    <p>Because of its sheer power and uncontrollable nature</p> Signup and view all the answers

    What is the name of the conservation organization that helped protect Mole Hill through a conservation easement?

    <p>Virginia Outdoors Federation</p> Signup and view all the answers

    Where are Virginia's two best-known volcanoes located?

    <p>In Rockingham and Highland counties</p> Signup and view all the answers

    What is the age of the volcanoes in Virginia?

    <p>Fairly recent, geologically speaking</p> Signup and view all the answers

    What is unusual about the volcanoes in Virginia?

    <p>They are the youngest on the East Coast of the United States</p> Signup and view all the answers

    Why did the volcanoes in Virginia erupt?

    <p>The reason is still unknown</p> Signup and view all the answers

    What is unique about the location of Virginia's volcanoes?

    <p>They are far from any tectonic plate boundary</p> Signup and view all the answers

    What was the time period of volcanic activity in Virginia?

    <p>Between 47 and 49 million years ago</p> Signup and view all the answers

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