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Mt St Helens Before VOLCANOES Reading: Chapter 9 Pages 224-242 Review Questions 1, 2, 3, 5, 9, 10, 11, 12 http://www.ncusd203.org/north/depts/science/slack/mt_helens.html Ash of Mt St Helens MtStHelens http://www.geology.mcmail.com/volcanoes.htm Mt St Helens After http://ve.ou.edu/weaver/st_helens/sthelens.htm http://www.ncusd203.org/north/depts/science/slack/mt_helens.html 1 Sept. 2002 Volcanocam see http://www.fs.fed.us/gpnf/volcanocams/msh/ Photo credit see http://www.roddyscheer.com/mt_st_helens.html Lava character http://ve.ou.edu/weaver/st_helens/sthelens.htm Pahoehoe lava http://www.doubledeckerpress.com/pahoe.htm Pahoehoe Pahoehoe http://gaia.busanedu.net/~creative/2002/cyber/rock/pages/20651_pahoehoe.htm http://www.mistermoose.org/rtw/usa/hawaii/pahoehoe.html 2 AA Volcanic bombs http://www.windows.ucar.edu/earth/geology/images/aa_pahoehoe_lg.jpg http://volcanoes.usgs.gov/Products/Pglossary/bomb.html bomb http://www.wooster.edu/geology/bjordan/ECalPics/ECal.html http://www.volcanicimages.com/krakatau/krakatau.html Kilauea spatter cone http://www.wooster.edu/geology/bjordan/ECalPics/ECal.html http://www.billystudio.com/photo_album/Big_Island/Volcano_Park_Slide/pages/Kilauea%20Spatter%20Cone%201984.htm 3 Composite cone http://courses.unt.edu/hwilliams/GEOG_3350/examreviews/volcanic_structures.htm Shield volcano http://volcanoes.usgs.gov/Products/Pglossary/ShieldVolcano.html Lava fountain from fissure Shield volcano http://earth.geol.ksu.edu/sgao/g100tu/plots/1008_shield_volc.jpg Curtain of fire http://www.uhh.hawaii.edu/~csav/gallery/decker/hawaii_curtain_of_fire.php Active Lava Tube http://www.doubledeckerpress.com/skylight.htm 4 Aspects of volcano types Cinder cone Cinder cones Paricutin http://www.greenville.k12.oh.us/volcano/cindercone.html http://courses.unt.edu/hwilliams/GEOG_3350/examreviews/volcanic_structures.htm Ash from Paricutin Paricutin http://www.bol.ucla.edu/~asuarezn/Paricutin_page.html http://www.greenville.k12.oh.us/volcano/cindercone.html 5 San Juan Parangaricutiro Mt Etna http://www.bol.ucla.edu/~asuarezn/Paricutin_page.html http://rst.gsfc.nasa.gov/Sect13/Sect13_4d.html http://www.geog.utah.edu/~hmiller/photos/Mt_Hood.jpg Composite cone Mt Hood http://courses.unt.edu/hwilliams/GEOG_3350/examreviews/volcanic_structures.htm Fujiyama Blasted summit of Mt. St. Helens http://earth.geol.ksu.edu/sgao/g100tu/plots/1008_composite_volc_Fujiyama.jpg http://ve.ou.edu/weaver/st_helens/sthelens.htm 6 Whaleback dome in Mt. St. Helens Nuee Ardente http://ve.ou.edu/weaver/st_helens/sthelens.htm Martinique http://ve.ou.edu/weaver/st_helens/sthelens.htm Video of nuee ardente: http://www.bedford.k12.ny.us/flhs/science/apes/images.html Lahar http://ve.ou.edu/weaver/st_helens/sthelens.htm 7 Crater Lake Caldera initial stage Caldera final stage Valles Grande http://ve.ou.edu/weaver/votw/valles.htm http://hvo.wr.usgs.gov/howwork/subsidence/inflate_deflate.html http://satftp.soest.hawaii.edu/space/hawaii/nav/ap.kilauea.html 8 http://hvo.wr.usgs.gov/howwork/subsidence/inflate_deflate.html Flood basalt http://hvo.wr.usgs.gov/howwork/subsidence/inflate_deflate.html Flood basalt http://www.bedford.k12.ny.us/flhs/science/images/floodbasalt.jpg Flood basalt http://www.gly.uga.edu/railsback/FieldImages/BasaltTwinFalls.jpeg Deccan basalt http://www.accuracyingenesis.com/deccan.html 9 Shiprock Volcanic summary http://www.uwosh.edu/faculty_staff/muldoon/51-360/Moes_pics/pages/6B_Ship_Rock_gif.htm 10