Volcanoes: Formation and Eruption
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Questions and Answers

What is released from a volcano during a volcanic eruption?

  • Only lava
  • Only gas
  • Magma
  • Lava, ash, and pieces of solid rock (correct)

    • How is a volcano formed?

  • When lava flows into the ocean
  • By the movement of small rocks near the surface
  • When hot, molten magma in the mantle layer cools and hardens (correct)
  • From the pressure of water trapped underground

    • What causes an eruption in a volcano?

  • Pressure buildup under the Earth's crust and movement of large pieces of crust (correct)
  • Too much sunlight on the volcano
  • The presence of animals near the volcano
  • Rainfall on the volcano

    • Where do most volcanoes form?

    <p>Along lines where pieces of the Earth's crust meet</p> Signup and view all the answers

    What is a volcanic pipe?

    <p>A pathway for gas and magma to escape from under the Earth's crust</p> Signup and view all the answers

    What is the result of a volcano erupting forcefully from a vent and the ash falling back to surround the vent?

    <p>Cinder cone volcano</p> Signup and view all the answers

    Which type of volcano has thin, runny lava that travels far from the original eruption site?

    <p>Shield volcano</p> Signup and view all the answers

    What type of volcanic plateau forms when lava from an eruption is thin and flows easily over a wider area?

    <p>Volcanic plateau</p> Signup and view all the answers

    Which type of eruption results from a crack in the Earth's crust allowing magma to escape without the need for a volcanic pipe or vent?

    <p>Fissure eruption</p> Signup and view all the answers

    What type of volcano is Mount St. Helens an example of?

    <p>Cinder cone volcano</p> Signup and view all the answers

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