Planet Earth 2 - Chapter 6 Magma Igneous Rocks Volcano a...

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Volcano: a vent at which melt from inside the Earth spews onto the planet’s surface Igneous Rock: made by the freezing of a melt Magma: melt that exists below the Earth’s surface Intrusive Igneous Rock: rock made by the freezing of magma underground, after is has pushed its way into preexisting rock of the crust Extrusive Igneous Rock: rock that forms by the freezing of lava above ground Pyroclastic Debris: fragmented material that sprayed out of a volcano and landed on the ground or sea floor in solid form Geotherm: the change in temperature with depth in the earth -The four types of magma 1) Felsic Magma: 66%-76% silica 2) Intermediate Magma: 52%-66% Silica -composition between that of felsic and mafic magma 3) Mafic Magma: 45%-52% silica 4) Ultramafic magma: 38%-45% silica Magma composition Viscocity: resistance to flow -felsic: higher viscocity than mafic magmas -felsic is less dense than mafic Partial Melting: the process during which only part of a rock melts to form a magma than then moves away -melts formed by partial melting tend to be richer in silica than the rock from
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This note was uploaded on 02/08/2012 for the course GEOLOGY 460:103 taught by Professor Feigenson during the Fall '10 term at Rutgers.

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Planet Earth 2 - Chapter 6 Magma Igneous Rocks Volcano a...

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