Volcanoes1 - Volcanoes-2/1/08 Types of volcanoes o...

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Volcanoes----2/1/08 Types of volcanoes o Stratovolcano Classic volcano, violent and active Layers of lava flows and pyroclastic debris (ash) Also called composite Finer particles of ash can travel farther, heavier ones drop down on volcano Examples Mt. Vesuvius (Italy) Mt. Pele (Martinique) Mt. St. Helens (US) Gamkonora (Indonesia) erupting now, ash killed pest called sexava o Shield Gentle, shallow slopes Largest of all volcanoes Frequently erupt under water Erupt by fissure eruptions (crack in the side of a volcano) and gentle lava flows Examples: Hawaii and Iceland Hot spots Hawaii
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Plate moves and hot spot stays in the same spot, will keep making new islands as pacific plate moves, old islands sinking and being eroded Loihi is the new island being formed (EXTRA CREDIT question) o Cinder Cone (Tephra Cone) Smallest volcanoes, but very steep Made up of lapilli and ash; no lava Often form on sides of larger volcanoes and in groups
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This note was uploaded on 04/07/2008 for the course ENV 114 taught by Professor Cole during the Spring '08 term at Northeastern.

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Volcanoes1 - Volcanoes-2/1/08 Types of volcanoes o...

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