Endogenic Processes: Magma and Volcanism Quiz
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Questions and Answers

What is magma?

  • A type of volcanic ash formed during eruptions
  • A mixture of molten rock, volatiles, and solid found on the Earth's surface
  • An underground reservoir of water and gas
  • A combination of molten rock, volatiles, and solid found beneath the Earth's surface (correct)

    • Which type of magma is formed in the upper mantle with low silica and gas content?

  • Andesitic magma
  • Obsidian magma
  • Basaltic magma (correct)
  • Rhyolitic magma

    • What causes volcanic eruptions?

  • The movement of tectonic plates
  • The release of trapped gases from magma (correct)
  • The cooling of magma beneath the Earth's surface
  • The presence of water vapor in the atmosphere

    • What is the typical temperature range for rhyolitic magma?

    <p>-650 to 800 degrees C</p> Signup and view all the answers

    Which type of volcano appears like large, broad shields from above?

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

    What happens when the pressure on magma is decreased as it rises?

    <p>The gas dissolved in the magma forms a separate vapor phase</p> Signup and view all the answers

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