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19. Volcanoes
    An online lesson on volcanoes, classification, and more...
    http: //volcano.und.nodak.edu/vwdocs/vwlessons/less...
    
    
20. Lava and Pyroclasts
    Learn about lava and pyroclasts, which are fragmented or broken rock.
    http: //volcano.und.nodak.edu/vwdocs/vwlessons/less...
    
    

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