Geology Basics: Lava, Igneous Intrusion, and Igneous Rock
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Questions and Answers

What is the term used to describe molten rock material that reaches the Earth's surface?

  • Silica
  • Lava (correct)
  • Igneous intrusion
  • Magma
  • Which process results in the slow cooling and solidification of molten rock material injected into the Earth's crust?

  • Erosion
  • Volcanism
  • Igneous intrusion (correct)
  • Denudation
  • What do the solidified lavas and intrusions collectively form?

  • Silica
  • Magma
  • Igneous rock (correct)
  • Granite
  • Which element is a basic component of silicate minerals?

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

    What causes a magma to solidify as a rock-glass without crystals?

    <p>Fast cooling</p> Signup and view all the answers

    What was the original term used for rocks containing high amounts of silica?

    <p>'Salts' of silicic acids</p> Signup and view all the answers

    What type of magmas are less viscous than acid magmas?

    <p>Basic magmas</p> Signup and view all the answers

    What is the estimated total area covered by basalt flows worldwide?

    <p>2.5 million km2</p> Signup and view all the answers

    What term is used to describe dissected volcanic cones of central eruptions that were active in past geological ages?

    <p>Fossil volcanoes</p> Signup and view all the answers

    What volcanic feature is characterized by large flat cones formed by successive flows of basaltic lava?

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

    What type of eruption is described as 'paroxysmal' due to the large gas content in the lavas?

    <p>'Central' eruption</p> Signup and view all the answers

    'Nuees ardentes' refer to:

    <p>'Glowing clouds'</p> Signup and view all the answers

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