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WikiPedia: Dung_nham http://link.brightcove.com/services/link/bcpid6872... http://www.m-w.com/dictionary/lava http://dictionary.reference.com/browse/lava http://www.sciencedirect.com/science?_ob=ArticleUR... http://volcano.und.edu/vwdocs/vwlessons/havo.html http://cat.inist.fr/?aModele=afficheN&cpsidt=59706... http://volcanoes.usgs.gov/Hazards/What/Lava/lavafl... http://volcanoes.usgs.gov/Products/Pglossary/aa.ht... http://volcanoes.usgs.gov/Products/Pglossary/pahoe... http://hvo.wr.usgs.gov/volcanowatch/2002/02_01_31....