Natural Disasters Study Guide Exam2

Natural Disasters Study Guide Exam2 - Natural Disasters...

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Natural Disasters Study Guide Extinctions, impacts, and volcanism Tektites – small glass objects formed form the impacts of larger meteorites on earth Iridium – dense metal found in meteorites with an abundance much higher than its average abundance in the Earth's crust. shocked quartz - (quartz under high pressure w/ limited temperature) Found in meteorite impact craters In what way are tektites, Iridium, and shocked quartz related to the K/T extinction event. - K/T extintion event left a clay layer around the earth, which had meteorites, tecktites shocked quartz and soot. In what way are the Deccan and Siberian flood basalt provinces related to mass extinction events? Deccan was volcanic activity that killed off life and Siberian was caused by the large asteroid impact Deccanis related to the Permian extinction (the greatest mass extinction event of all time) . Siberian is related to the K/T extinction Eon - the greatest expanse of geologic time -Palaeozoic Era - the Era of Ancient Life -Mesozoic Era- the Era of Middle Life / the age of the Dinosaurs -Cenozoic Era - the Era of Recent Life / the age of mammals Tunguska, (1908) major impact in central Serbia, Tungusta river basin heard 1000km away, shockwave traveled around the world twice, flattened trees like matchsticks in a radial pattern 20 miles from blast center. Thousands of animals and tribes perished. 2 nd expedition 19 years later showed not crater. Computer simulations showed that a stony meteorite ~30m in diameter exploded a few km above ground. Chicxulub, crater supports the Alvarez theory that the K/T extinction event was cause by large meteorite. The impact caused mega tsunamis, a large cloud of super heated dust, ash and steam spread from the impacts. Along with global wildfire, earthquakes, and volcanic activity. Greenhouse effect could have lasted a decade
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Meteor Crater - "the first proven, best-preserved meteorite crater on earth." 50,000 years ago. Large explosion about equal to thermonuclear explosion. Transformed carbon into diamons Eugene Shoemaker - conclusively showed that Barringer Meteor Crater, located near Winslow, Arizona, arose from a meteor impact. Showed that the Moon was covered with a wide size range of impact craters. Discovered a comet that hit Jupiter and cause a
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This note was uploaded on 12/09/2008 for the course GEOG 303 taught by Professor Camp during the Spring '08 term at San Diego State.

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Natural Disasters Study Guide Exam2 - Natural Disasters...

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