Study

Igneous Rocks

  •   0%
  •  0     0     0

      Back   Restart
  • What does the word "igneous" mean?
    It means "fire." Igneous rocks come from magma that has cooled into solid rock.
  • What is quartz made of?
    Silica and oxygen.
  • What is an intrusive igneous rock?
    A rock that forms when magma cools slowly inside the Earth's crust.
  • What process occurs when magma cools and turns into a solid?
    Solidification.
  • Why can’t we see the crystals in some igneous rocks with the naked eye?
    Because they are too small due to rapid cooling.
  • Why does granite have different colors?
    It contains different minerals like quartz, feldspar, and mica.
  • What happens when rocks above intrusive igneous rocks wear away?
    The intrusive rock (e.g., granite) appears at the surface.
  • What is the most important characteristic of all igneous rocks?
    They are crystalline (made of crystals).
  • Give an example of an intrusive igneous rock.
    Granite.
  • What are igneous rocks made of?
    Minerals, such as silica, oxygen, aluminum, magnesium, and iron.
  • Why do intrusive igneous rocks have large crystals?
    They cool slowly inside the Earth's crust, allowing large crystals to form.
  • Give an example of an extrusive igneous rock.
    Basalt.
  • What is an extrusive igneous rock?
    A rock that forms when lava cools on the Earth's surface.
  • What does "solidification" mean?
    The process of magma cooling and becoming solid rock.
  • Why do the crystals in basalt appear so small?
    The lava cools quickly, so the crystals don’t have time to grow.
    • Your experience on this site will be improved by allowing cookies.