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Geology 5

Earthquakes, Volcanoes, and Plate Tectonics

QuestionAnswer
magma molten tock usually at depth, often includes dispersed crystals, so 'melt' can be used when referring to the liquid component
lava molten rock at the surface, term also used to describe rock formed in this way after it has solidified
lithosphere crust and upper mantle
constructive plate boundaries 2 plates move apart and form new oceanic lithosphere
ophiolites a slice of oceanic crust and upper mantle that has been thrust over the edge of a continent
plate tectonics the rigid plate of lithosphere move around
continental drift movement of continents due to plate tectonics
low speed layer lubricates the base of continental crust so they can drift
fault fructure in Earth's crust along which motion may occur, mark's boundary between 2 plates
transform fault found where 2 plates slide laterally against each other
pahoehoe flow Hawaiian term, lava with smooth, billowy, or ropy surface
aa flow Hawaiian term, lava flow whose surface is broken into rough angular fragments, rought jagged blocks
caldera a basin-shaped volcanic depression at least 1 mile in diameter
pillow lava interconnected, sack-like bodies of lava formed underwater
conduit passage followed by magma in a volcano
focus break point of 2 plates-underneath Earth
epicenter point on surface of Earth above focus
Created by: kcoal4
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