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Unformatted text preview: Volcanoes Chapter 5 Where do volcanoes form? Convergent plate boundaries (the most common and the most active) Ocean-Continent Andean Intraplate Overriding (TEXAS) Ocean-Ocean Island Arcs Aleutians Japan Hot Spots Hawaii Divergent Plate Boundaries Sea foor spreading zones RiFt valleys Intraplate Settings Hot spots (Hawaiian Islands, Yellowstone NatPrk) Overriding plates What are the products of volcanic activity? Lavas Mac lavas Low viscosity Large fows (little ash) Pahoehoe (ropey) and aa (blocky) (hawaiian words) NOTE VOLATILES increase power of eruption Intermediate lavas elsic lavas High Viscosity High in volitiles small fows (lots oF ash) lava domes (plug things up) Pyroclastics ash smallest less than 2 mm Volcanoes Chapter 5 P.154 concept art Fig. 5-20 p.151 could potentially cover the world and block out the sun (travels huge distances) can produce ash fall ash Fow...
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- Fall '08