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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.
- Spring '08