GLG 101 Quiz: STUDY FOR GEOLOGY TEST Chapter 4
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Study for geology test 1 - 6 chapters. Magma is liquid rock (melt) under the earth"s surface. Lava is melt that has erupted from a volcano at the earth"s surface. This process occurs when pressure decreases (decompression), when volatiles (such as water) diffuse into hot rock, and when heat transfers from hot magma into adjacent rock. Magma occurs in a range of compositions: felsic (silicic), intermediate, mafic, and ultramafic. Composition depends partly on the original composition of the source rock and partly on the way the magma evolves. During partial melting, only part of the source rock melts, so magma tends to be more felsic. Magma rises because of its buoyancy and because of pressure within the magma. Magma viscosity (resistance to flow) depends on its composition. Felsic magma is more viscous than mafic magma.
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