Igneous Rocks and the Rock Cycle
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Questions and Answers

What process forms igneous rocks?

  • Metamorphism
  • Crystallization of magma (correct)
  • Weathering and erosion
  • Deposition and compaction
  • What is the meaning of the word 'igneous'?

  • Water
  • Ice
  • Air
  • Fire (correct)
  • In which part of Earth's crust do intrusive igneous rocks form?

  • Deep below ground (correct)
  • At the surface of a volcano
  • Above ground
  • Near the surface
  • Which type of igneous rock is formed when magma cools slowly inside Earth's surface?

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

    What determines the type of crystals formed in igneous rocks?

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

    What type of texture does obsidian, an extrusive igneous rock, have?

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

    At what stage of the rock cycle are igneous rocks formed?

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

    What is the state of magma when it forms igneous rocks?

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

    Which mineral is usually the most abundant oxide in igneous rocks?

    <p>Silicon dioxide</p> Signup and view all the answers

    What is the characteristic color of felsic rocks?

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

    How do extrusive igneous rocks form?

    <p>By crystallization above ground</p> Signup and view all the answers

    Which type of igneous rock has a porphyritic texture?

    <p>Both intrusive and extrusive rocks</p> Signup and view all the answers

    What is the characteristic cooling process for aphanitic igneous rocks?

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

    Which type of igneous rock is classified as mafic?

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

    What causes the bubbly texture in rocks like pumice?

    <p>Discharge of water and gasses from a volcano</p> Signup and view all the answers

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