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Unformatted text preview: Tephra rock fragments thrown into air during volcanic eruption. Classified by size: Dust Ash Lapilli little stones Blocks (large &amp; angular) Volcanic Bombs (large &amp; rounded ; cool in the air or on contact with ground) Pyroclastic flow cloud of gas, ash and tephra that comes from explosive eruption. Travels nearly 200 km/h 700 degrees Celsius Mount Pele on island of Martinique in 1902 killed more than 29000 people. Where do most volcanic eruptions occur? 80% Convergent Plate boundaries Ring of Fire largest ring of volcanic activity around Pacific plate. Mediterranean Belt includes Mount Etna and Mount Vesuvius 15 % Divergent Plate boundaries (Mid Atlantic Ridge) 5% form away from plate boundaries at : Hot Spots stationary plumes of magma that push up a volcanic island of seamount. Hawaiian Island Chain....
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This note was uploaded on 12/25/2011 for the course GEOG 123 taught by Professor Mitchelle during the Fall '10 term at Everglades.
- Fall '10