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volcanoes (volcanic eruptions (ashfall, mudflows, lava flows (pumice,…
volcanoes
volcanic eruptions
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ashfall, mudflows, lava flows
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explosive- vent is blocked, sticky magma
water vapor, carbon dioxide, sulfur oxide
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Mount St. Helens
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march 27, creates a huge crater
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where do volcanoes form?
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changes in shape, eruptive history, gas
types of volcanoes
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composite volcanoes- large, steep-sided volcanoes that result from explosive eruptions of andesitic and rhyolotic lava and ash along convergent plate boundaries
cinder cones- small, steep-sided volcanoes that erupt gas-rich, basaltic lavas
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legends
Pompeii- vacation place for romans, 11,000 people, advanced complex water system
roman religion- gods and goddesses, vulcan- god of fire, annual festival held august 23, bonfires- sacrafised fish and small animals in place of humans
frequent earthquakes, 69 A.D. - earthquake damaged buldings in the city, few buildings were repaired- many left the way they were
mount vesuvious erupted in august 24, 79 A.D. 13-20 feet of ash, 1599 initial rediscovery of the city, 1748 started to escalate the site
what is a volcano?
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lava - above the surface, three types ( pahoehoe, aa, pillow lava)