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Unformatted text preview: Texture Rocks that cool BELOW the surface are coarse-grained Where does magma come from? Pockets under the earths surface NOT in the core NOT a layer beneath Earths surface Magma forms in pools just beneath the surface Change in melting point (water) Temperature variations trigger melting Why does magma rise? Melted rock is lighter than the surrounding material Why are there intrusive rocks of different compositions? Most of the Earth is mafic...
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This note was uploaded on 03/29/2008 for the course GLG 201 taught by Professor Libarkin during the Spring '07 term at Michigan State University.
- Spring '07