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Unformatted text preview: 3. Oceanic crust melts into magma 4. Magma rises through cracks in continental crust Earthquakes: most severe earthquakes (and volcanoes) occur near plate collision boundaries So much money is put into seismology because we want to track atomic and nuclear bomb activity Earthquakes: the energy released by an earthquake is measured by the Richter scale Large earthquakes occurring near developed areas can cause great damage Richter scale is 1-10, each step up is ten times bigger: 6 to 7 is 10x, 6 to 8 is 100x, 6 to 9 is 1000x Crater Lake, Oregon: formed when a volcano erupted and the walls collapsed inward Volcanoes sit at the middle of plates in Yellowstone and Hawaii, due to hot spots in the core, caused when plates where dragged over the hot spot, causes linear chains of volcanoes Formation of the islands of Hawaii is a great example of the Pacific plate moving over a fixed hotspot...
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- Spring '08