Formation of Volcanoes and Key Terms
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Questions and Answers

What distinguishes shield volcanoes from other types of volcanoes?

  • Gently sloped profile (correct)
  • High levels of dissolved gases
  • Lava breaking through walls
  • Cluster of vents
  • Which type of volcano is considered the most dangerous?

  • Magma Volcano
  • Shield Volcano
  • Composite Volcano (correct)
  • Caldera Complex
  • What is the main difference in magma composition between Magma Volcanoes and Shield Volcanoes?

  • Formation process
  • Amount of silica (correct)
  • Cluster of vents
  • Eruption height
  • How are Shield Volcanoes primarily built up?

    <p>By many layers of low-viscous lava flows</p> Signup and view all the answers

    What is a common feature of calderas formed at the summit of shield volcanoes?

    <p>Formation of new depressions</p> Signup and view all the answers

    Which type of volcano is known for their huge, gently sloped profiles?

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

    What is the term used to describe the property of a material's resistance to flow?

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

    Which type of volcanic eruption is associated with explosive outbursts that generate pyroclastic flows?

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

    What type of volcanic eruption is characterized by effusions of molten basaltic lava that flow from long, parallel fissures?

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

    How does the viscosity of a liquid change with an increase in temperature?

    <p>Viscosity decreases</p> Signup and view all the answers

    Which factor increases with an increase in silica content in magma?

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

    What factor affects the types of volcanic eruptions by influencing magma chemistry and content?

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

    What is the term used once magma erupts through the Earth's surface?

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

    Which type of volcano is formed by fluid lava ejected due to high pressure in the magma chamber?

    <p>Cinder Cone</p> Signup and view all the answers

    What is the combination of the Earth's crust and the uppermost part of the mantle called?

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

    During which geological process does one tectonic plate move under another at convergent boundaries?

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

    Which type of volcano is also known as a stratovolcano and is formed by highly viscous or thick, slow-moving magma?

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

    What is a mass of molten rock ejected during an eruption called?

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

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