Magma Viscosity Factors Quiz
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Questions and Answers

What type of volcano is characterized by steep sides, a symmetrical cone shape, sticky lava, and alternating layers of lava flows, volcanic ash, and cinders?

  • Cinder cone volcano
  • Composite/Stratovolcano (correct)
  • Caldera volcano
  • Shield volcano

    • Which type of lava has the least explosive nature due to its low viscosity?

  • Andesitic lava
  • Rhyolitic lava
  • Dacitic lava
  • Basaltic lava (correct)

    • What are the roles of volcanoes in Earth's system according to the text?

  • Providing fertile soil through mineral-rich volcanic ash (correct)
  • Decreasing atmospheric oxygen levels
  • Creating deserts and arid landscapes
  • Causing global cooling by releasing greenhouse gases

    • Which volcanic region within a rigid plate is characterized by molten rock materials reaching the Earth's surface?

    <p>Hot Spot</p> Signup and view all the answers

    What determines the nature of a volcanic eruption?

    <p>The viscosity of the magma</p> Signup and view all the answers

    Which volcano type is described as having a broad, slightly domed shape and fluid basaltic lava?

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

    What effect does a higher temperature have on the viscosity of magma?

    <p>Decreases viscosity</p> Signup and view all the answers

    How does the silica content of magma affect its viscosity?

    <p>Increases viscosity</p> Signup and view all the answers

    What happens to the viscosity of magma with a higher amount of dissolved gases?

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

    Which type of magma is likely to result in an explosive eruption?

    <p>High viscosity magma</p> Signup and view all the answers

    How does highly viscous magma affect the release of gas during an eruption?

    <p>Prevents gas release</p> Signup and view all the answers

    What negative effects are associated with pyroclastic flows during a volcanic eruption?

    <p>Destruction of lives and properties</p> Signup and view all the answers

    What is the difference between lava and magma?

    <p>Lava is magma that reaches the Earth's surface, while magma is molten rock found underneath the Earth's surface.</p> Signup and view all the answers

    What causes magma to rise to the Earth's surface?

    <p>Magma being less dense than solid rocks and being squeezed by tectonic forces.</p> Signup and view all the answers

    What is the main characteristic of dormant volcanoes?

    <p>They have not erupted in the last 10,000 years but are expected to erupt again in the future.</p> Signup and view all the answers

    What type of volcanic vent emits gases only?

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

    How is a caldera different from a crater?

    <p>A caldera is a basin-shaped depression formed when the volcanic cone collapses, while a crater is a funnel-shaped pit at the top of a volcanic vent.</p> Signup and view all the answers

    Why does magma rise upward towards the Earth's surface?

    <p>As it is squeezed by tectonic forces and less dense than solid rocks.</p> Signup and view all the answers

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