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Volcanoes - on B and C show the development of the debris...

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    Volcanoes Volcanoes Mt. Etna, Sicily, Italy August 5, 1997 with city lights.
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Ring of Fire Ring of Fire The Ring of  Fire  coincides  with the edges  of one of the  world’s main  tectonic plates. The Ring of  Fire has  frequent  earthquakes  and volcanic  eruptions.
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Mount Pinatubo Mount Pinatubo Mount Pinatubo prior to the 1991 eruption  (elevation 5725 feet).
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The Eruption of 1991 The Eruption of 1991 June 12-15, 1991  brought eruptions of  Pinatubo to the  island of Luzon. From eruption  columns 18 km wide  and up to 30 km  high, 5 billion cubic  meters of pyroclastic  and ash poured out. 20 to 30 megatons  of sulfur dioxide and  aerosols were also  released into the air.
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Satellite  images of  the volcanic  cloud, over  9 days,  showing the  dispersal of  the sulfur  dioxide  plume.
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Mount St. Helens Mount St. Helens Before
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May 18, 1980 May 18, 1980
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A. Mount St. Helens early 
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Unformatted text preview: on May 18, 1980 B. and C. show the development of the debris avalanche, the beginning of the vertical eruption and lateral blast. The bulge block slid first followed by the graben block. (in 1 st 30 sec) D. The summit black slid, and the lateral blast was completed. The vertical eruption is in full fury. (in 1 st minute) (on left): The extent of the lateral blast (on right): What appears to be blown grass, are actually large tress, some over 100 feet tall, flatten by the lateral blast. Ash Fallout Ash Fallout Distribution of ash fallout from the May 18, 1980 blast. Results of May 18, 1980 Results of May 18, 1980 (on left): Geologic map showing the impacts and deposits. (on right): Mud flow damaged house. Mount St. Helens Mount St. Helens After...
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