How rocksform
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Rocks are classified into three major groups: igneous rock forms when magma or lava cools, sedimentary rock forms when particles are pressed together, and metamorphic rock forms when heat and pressure change any existing rock.
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How rocksform
- 2. Key Concept Geologists classify rocks into three major groups: Igneous Rock Sedimentary Rock Metamorphic Rock
- 3. 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.