Igneous Rock Formation
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Questions and Answers

What is the main process involved in the formation of igneous rocks?

  • Cooling and solidification of magma or lava (correct)
  • Formation through compaction of organic materials
  • Heat and pressure acting on existing rocks
  • Erosion and deposition of sediment

    • Where does the magma, which forms igneous rocks, come from?

  • Biological processes in soil
  • Partial melts of existing rocks in a planet's mantle or crust (correct)
  • Volcanic ash deposition
  • Chemical weathering of sedimentary rocks

    • What are the two main types of igneous rock solidification processes mentioned in the text?

  • Intrusive and extrusive (correct)
  • Weathering and erosion
  • Compaction and cementation
  • Metamorphism and sedimentation

    • What percentage of the top 16 kilometers of the Earth's crust by volume is composed of igneous and metamorphic rocks?

    <p>90–95%</p> Signup and view all the answers

    What is the characteristic of intrusive igneous rocks due to slow cooling within the crust?

    <p>Coarse-grained (phaneritic)</p> Signup and view all the answers

    Which type of igneous rock is typically associated with important mineral deposits such as tungsten and tin?

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

    What is the term for the extrusive igneous rock that forms lava flows, lava sheets, and lava plateaus?

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

    What are the intrusive igneous rocks that form near the surface termed as?

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

    Which type of intrusive igneous rock is usually much finer-grained and often resembles volcanic rock?

    <p>Hypabyssal rock</p> Signup and view all the answers

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