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Rocks: Definition
Observe the following picture:
What are rocks made of?
What do you notice about the rock?
What is it made of?

  • Rocks are extensive mineral bodies composed of one or more minerals in different amounts, which form part of the earth's crust.
    • Rocks are made of two or more different minerals that have been:
      • cemented together, or
      • squeezed and heated together, or
      • melted and cooled together.
    • Rocks make up the majority of the Earth's crust. One of the most common rock is granite. The four minerals that make up granite are feldspar, quartz, mica and hornblende. These are some of the same minerals that you learned about!!


Pennsylvania Geology | Which Way is North? | Geologic Explorations | Dino Inquiry | Wonderful World of Rocks and Minerals

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