Volcanoes These notes go on p. 11 of your inb !!!. Volcanic Settings (Plate Boundaries). Ocean-Continent Convergence. Ocean-Ocean Convergence. CONTINENTAL divergence. Ocean Divergence. Major Volcanoes Around the World.
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VolcanoesThese notes go on p. 11 of your inb!!!
Major Volcanoes Around the World
“RING OF FIRE”:Area surrounding the pacific plate where the most volcanoes & earthquakes occur
Chemistry of Magma
Gases within the magma
Water content of magma
Caldera: large crater shaped basin that forms when the top of a volcano collapses
1. Cinder Cones: explosive eruptions, small but steep slopes, pyroclastics
2. Shield: non-explosive eruptions, fluid basaltic lava, gentle broad slopes
3. Composite Cones/Stratovolcanoes: alternating between lava and pyroclastics, explosive and non-explosive eruptions, very steep/tall
Volcanism at different plate boundaries
Mostly Explosive Eruption (violent):high viscosity, does not flow easily, gases trapped, hard to predict explosions
Magma Type: felsic & mafic
Volcano Type: Composite Cone (Stratovolcanoes) & cinder cones
Other Features: gas flows, calderas, aerial bombs
searing superheated gas and volcanic ash & dust; very fast
Mt. St. Helens Eruption
Type of Eruption
Rifts, oceanic hot spots
Continental hot spots
Magma and Erupted Materials
about it’s “personality.”
Must include type of eruption, type of lava, size/shape, and location.