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Rocks - Coggle Diagram

- - - - Cools slowly below the surface.
      - Ex. Granite
    - - When magma erupts and it forms lava above the surface.
      - Ex. Pumice
      - When lava cools down some holes appear.
      - Obsidian
        
        When lava isn't mixed with gases or water and it cools quickly.
        
        Hard rocks with crystals that we can't see with our naked eye - We need a microscope**.