Tectonics of Magma. From partial melting of mantle Occurs at oceanic ridges and mantle plumes More dense: makes oceanic crust

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Transcription:

VOLCANOES

Tectonics of Magma Basaltic magma From partial melting of mantle Occurs at oceanic ridges and mantle plumes More dense: makes oceanic crust Granitic magma From melting of crust, with water as flux Occurs at convergent boundaries Less dense: makes continental crust

Mt St Helens Before http://www.ncusd203.org/north/depts/science/slack/mt_helens.html

Hawaii http://volcano.und.nodak.edu/vwdocs/volc_images/north_america/hawaii/big_island.html

http://www.fhvnp.org/albums/seminar_1142006.htm Kilauea

Low viscosity lava http://smart.tin.it/domsky/4/fotos-imagenes/immagini/1/2002_07_28_archive.html

Ash of Mt St Helens

Terms Viscosity: resistance to flow Pyroclastic: material blown into the air by volcanic eruption What is the relationship of lava viscosity to pyroclastic production by a volcano? Greater viscosity=more likely to have pyroclastic material

Lava character Volcanic gas information below http://volcanoes.usgs.gov/hazards/what/volgas/volgas.html

Kilauea spatter cone http://www.billystudio.com/photo_album/big_island/volcano_park_slide/pages/kilauea%20spatter%20cone%201984.htm

http://www.geology.mcmail.com/volcanoes.htm MtStHelens

Ash Bed http://www.wooster.edu/geology/bjordan/ecalpics/ecal.html (dead link 2007.11.13)

Volcanic bombs http://volcanoes.usgs.gov/products/pglossary/bomb.html

Ash of Mt. St. Helens http://ve.ou.edu/weaver/st_helens/sthelens.htm

Mt St Helens After http://www.ncusd203.org/north/depts/science/slack/mt_helens.html

Sept. 2002 Volcanocam see http://www.fs.fed.us/gpnf/volcanocams/msh/ Photo credit see http://www.roddyscheer.com/mt_st_helens.html

http://www.doubledeckerpress.com/pahoe.htm Pahoehoe lava

Pahoehoe http://gaia.busanedu.net/~creative/2002/cyber/rock/pages/20651_pahoehoe.htm

Pahoehoe http://www.mistermoose.org/rtw/usa/hawaii/pahoehoe.html

AA http://www.windows.ucar.edu/earth/geology/images/aa_pahoehoe_lg.jpg

http://www.wooster.edu/geology/bjordan/ecalpics/ecal.html Welded tuff

Ash Bed http://www.wooster.edu/geology/bjordan/ecalpics/ecal.html

bomb http://www.volcanicimages.com/krakatau/krakatau.html

Volcanic bombs http://volcanoes.usgs.gov/products/pglossary/bomb.html

http://www.geog.utah.edu/~hmiller/photos/mt_hood.jpg Mt Hood

Fujiyama http://earth.geol.ksu.edu/sgao/g100tu/plots/1008_composite_volc_fujiyama.jpg

Paricutin http://www.bol.ucla.edu/~asuarezn/paricutin_page.html

Crater Lake

Kilauea Caldera http://www.globalgeografia.com/album/oceania.htm

Shield volcano http://volcanoes.usgs.gov/products/pglossary/shieldvolcano.html

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

Lava fountain from fissure

http://www.doubledeckerpress.com/skylight.htm Active Lava Tube

Parícutin http://www.greenville.k12.oh.us/volcano/cindercone.html

Cinder cones http://courses.unt.edu/hwilliams/geog_3350/examreviews/volcanic_structures.htm

Cinder cone

Ash from Paricutin http://www.greenville.k12.oh.us/volcano/cindercone.html

Paricutin http://www.bol.ucla.edu/~asuarezn/paricutin_page.html

San Juan Parangaricutiro http://www.bol.ucla.edu/~asuarezn/paricutin_page.html

http://rst.gsfc.nasa.gov/sect13/sect13_4d.html Mt Etna

Aspects of volcano types

Composite cone http://courses.unt.edu/hwilliams/geog_3350/examreviews/volcanic_structures.htm

http://pubs.usgs.gov/gip/dynamic/fire.html Ring of fire

Cascade Volcano eruptions http://ve.ou.edu/weaver/st_helens/sthelens.htm

http://www.geog.utah.edu/~hmiller/photos/mt_hood.jpg Mt Hood

Blasted summit of Mt. St. Helens http://ve.ou.edu/weaver/st_helens/sthelens.htm

Whaleback dome in Mt. St. Helens http://ve.ou.edu/weaver/st_helens/sthelens.htm

Nuee Ardente

http://www.geology.sdsu.edu/ how_volcanoes_work/pelee.html Martinique

Martinique Video of nuee ardente: http://www.bedford.k12.ny.us/flhs/science/apes/images.html http://www.geo.mtu.edu/volcanoes/west.indies/soufriere/govt/images/051296/pf_sea.mpg

St Helens Blast Zone http://ve.ou.edu/weaver/st_helens/sthelens.htm

Lahar Link to Nevado del Ruiz http://volcanoes.usgs.gov/hazards/what/lahars/ruizlahars.html

St Helens Deposits http://ve.ou.edu/weaver/st_helens/sthelens.htm

Crater Lake

Caldera initial stage

Caldera final stage

Kilauea Caldera http://satftp.soest.hawaii.edu/space/hawaii/nav/ap.kilauea.html

Kilauea Caldera Stage 1 http://hvo.wr.usgs.gov/howwork/subsidence/inflate_deflate.html

Kilauea Caldera Stage 2 http://hvo.wr.usgs.gov/howwork/subsidence/inflate_deflate.html

Kilauea Caldera Stage 3 http://hvo.wr.usgs.gov/howwork/subsidence/inflate_deflate.html

http://ve.ou.edu/weaver/votw/valles.htm Valles Grande

Flood basalt

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

Shiprock http://www.uwosh.edu/faculty_staff/muldoon/51-360/moes_pics/pages/6b_ship_rock_gif.htm

Volcanic summary

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