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Glg 101 week4 Discussion question 1

Glg 101 week4 Discussion question 1 - B)Subduction plate...

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Glg 101 week4 Discussion question 1 A) Most of the volcanoes on earth are located along or near shifting plate boundaries and are called "boundary volcanoes". plate tectonics, or the movement of different geographic regions of the earth's surface called 'plates' relative to each other is the primary driver for the formation and activity of volcanoes. One type of plate boundary is a 'subuction boundary' in which one plate is sliding beneath another plate. On these subduction boundaries part of the upper layer of crust is subducted and when it reaches a sufficient depth and temperature it melts to become liquid rock or magma. These upper layers of the crust are much less dense than the rock composing most of the mantle and so when it melts the magma rises up and pushes through the crust of the upper plate forming volcanoes.
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Unformatted text preview: B)Subduction plate boundaries/margins do C) Mount Krakatoa located between the islands of Java and Sumatra is one of the worlds most famous volcanoes known mostly for its eruption in 1883. It is considered a very active volcano with eruptions as recent as this year. Krakatoa's impact on the area around it has been momentous including completely remodeling its immediate area by remodeling the island of Krakatoa and causing huge title waves that destroyed many nearby villages. The official death toll for the 1883 irruption was 36,417. This volcano has also had major world wide effects in that it is estimated that the particulates ejected by the 1883 eruption caused a 1.2 degree Celsius drop in global temperatures the following year....
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