Formation of Igneous Rocks
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Questions and Answers

What type of rock is obsidian?

  • Coarse in texture
  • Hardened volcanic ash
  • Lightweight and covered in small holes
  • Black and glassy looking (correct)

    • Which rock type forms from cooled magma under the Earth's surface?

  • Pumice
  • Basalt
  • Tuff
  • Granite (correct)

    • What distinguishes intrusive igneous rocks from extrusive igneous rocks?

  • They cool slowly under the Earth's surface (correct)
  • They have small holes on the surface
  • They form quickly on the Earth's surface
  • They are black and glassy

    • Which rock type is often used for countertops and stone pillars?

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

    What is the main similarity between pumice and the foam in a soda?

    <p>Both have small holes</p> Signup and view all the answers

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