How rocks form
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How Rocks Form. Key Concept. Geologists classify rocks into three major groups: Igneous Rock Sedimentary Rock Metamorphic Rock. How Are Rocks Classified?. Igneous Rock- forms when magma or lava cools .

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Key concept l.jpg
Key Concept

  • Geologists classify rocks into three major groups:

    Igneous Rock

    Sedimentary Rock

    Metamorphic Rock


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How Are Rocks Classified?

  • Igneous Rock- forms when magma or lava cools.

  • Sedimentary Rock- forms when particles are pressed and stuck together.

  • Metamorphic Rock- forms when heat and pressure change any kind of rock.