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Structure Basics
Friday, July 31, 2009 • 1:28 PM • 0 comments

structure of vents in a volcano We'll start at the bottom when we look at the structure of a volcano. All of the molten rock in the asthenosphere finds weaknesses in the crust. The molten rock creates a main passageway called a central vent. As the magma rises, secondary vents develop. Those secondary ones are just smaller and branch from the main tube. At the top of the volcano, at its highest point, is a crater. Some volcanoes have something called a caldera. A caldera forms when a volcano gets hollow and then collapses on itself. A caldera could look like a large indentation on the side of the volcano or it could happen at the very top. Please visit at "http://www.geography4kids.com/files/earth_volcano.html".

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