hw6 - when a magma chamber near the surface encounters...

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Geology 121. Dr. Bonnie (Barbara) Souter 1.) What are the three different type of (central vent) volcanoes? What type of lava and/or ash is typical for each ones eruptive style? Correct Answer: Cinder cones erupt felsic ash. Stratovolcanoes erupt andesite lava, or both felsic ash and basaltic lava. sheild volcanoes erupts basalic lava. Feedback: Please use complete sentences 2.) List and define the three types of eruputive styles in your own words. Correct Answer: Effusive eruptions are relatively quiet eruptions characterized by large amounts of basaltic lava. Explosive eruptions are characterize by explosive eruptions of ash and pyroclastic material. Phreatomagmatic eruptions are highly explosive eruptions that occur
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Unformatted text preview: when a magma chamber near the surface encounters water and is vaporized rapidly, propelling eruptive material out of the magma chamber. 3.) What are two ways in which geologists determine that a volcano is about to erupt? What does each indicate about the movement of the magma chamber? Correct Answer: Active, eruptive volcanoes are characterized by changing topography as the magma migrates. Heat changes occur as the magma gets closer to the surface. Microseismicity (little earthquakes) occur as the magma pushes aside rock and changes the stresses in the earth....
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This note was uploaded on 04/07/2008 for the course GEOL 121 taught by Professor Dr.souter during the Spring '08 term at Towson.

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