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Unformatted text preview: 1. Introduction (Modified 29 Aug 2008) Welcome to Unit 3: Introducing Mountain Building & Volcanism (Volcanoes!) They tied pillows on top of their heads as protection against the shower of rock. It was daylight now elsewhere in the world, but there the darkness was darker and thicker than any night(t)hen came a smell of sulfur, announcing the flames, and the flames themselveshe stood up, and immediately collapsedhis breathing was obstructed by the dust-laden air. Account by Pliny the Younger of the death of Pliny the Elder in the eruption of Mount Vesuvius in A.D. 79 that destroyed Pompeii and Herculaneum in Italy. [http://vulcan.wr.usgs.gov/Outreach/Publications/GIP19/chapter_one_eruption.pdf.] Flotilla fresco: 16th century BC, from Akrotiri, Thera. West House, North Wall, Room 5. The Meeting on the Hill, Pastorialism, Shipwreck, and Warriors. Morgan, Lyvia. The Miniature Wall Paintings of Thera: A Study in Aegean Culture and Iconogoraphy. New York: Cambridge University Press, 1988. Atlantis supposedly was an island civilization, "outside the Pillars of Hercules" and thus in the Atlantic Ocean, that was destroyed by an earthquake or tsunami (giant wave) about 11,000 years ago. The source of this information (according to the Wikipedia) is an account that Plato wrote in 360 BC of information reportedly given to Solon two hundred years earlier by priests he visited in Egypt. Now, if someone told you that someone else 200 years earlier had been told by someone about something that happened 9000 years earlier, would you immediately believe it? A lot of people apparently do; a search of Google for "Atlantis Plato" finds "about 327,000" matches, and not all of them are academic discussions. A better question might be whether there really are islands that disappear below the sea. The answer is yes; many do. Some slide slowly downhill, as fast as your fingernails grow, and disappear first beneath the waves and then beneath the continents. And others suddenly explode, and scatter themselves across the world. Before we go any further, take a look at the following short video introduction by Dr. Anandakrishnan... TECH NOTE- If this video doesn't run properly, you may need to update your Quicktime plugin. You can do so by going to the Apple/QuickTime Web site and installing the free download - http://www.apple.com/quicktime/ Unit 3 1. Textbook 3.1: Plate Tectonics II, Crater Lake (Modified 13 Aug 2008) Crater Lake, at 1932 feet (about 600 m) deep, is the deepest and probably the cleanest lake in the United States. Crater Lake sits in a great volcanic crater or caldera, 5 miles (8 km) across, formed when Mt. Mazama experienced a cataclysmic eruption about 6600 years ago. That massive eruption laid down ash that is 200-300 feet thick (almost 100 m) on the flanks of the volcano; the ash forms a recognizable layer hundreds of miles away in Yellowstone, and has been identified in Greenland ice cores....
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