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Rocks - Coggle Diagram

- - - - cools slowly below the surface
      - Ex.Granite
    - - when magma erupts and it
        forms lava above the surface
      - when lava cools down some holes appear
      - Ex.Pumice
      - Obisidian
        
        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