09 GEOS 1004 - GEOS 1004 SPOTILA Lecture 3 GEOLOGIC TOOLS I...

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GEOS 1004, SPOTILA Lecture 3, 9/1/09 GEOLOGIC TOOLS I: ROCKS Why study rocks? Preserves a record of events at the surface To learn about the earths interior rock = a naturally occurring, solid aggregate of minerals. Can be separated into pieces of different composition (a mineral cannot). IGNEOUS, SEDIMENTARY, METAMORPHIC - THE ROCK CYCLE 1) igneous - crystallize from magma (molten rock) -volcanic = form at surface; layered, fine grained -intrusive = form at depth, are massive (no layers) and more coarse 2) sedimentary - deposited physically (i.e. sand, mud) or chemically (i.e. salt, limestone) at the surface (usually in water). Weathering – erosion – deposition in layers. 3) metamorphic - minerals recrystallize in extreme heat and pressure to new equilibrium form; change in the solid state (if it melts, it becomes igneous). *Wavy forms, irregular, as if cooked; ROCK CYCLE: processes by which each group of rocks is produced from the other two: 1) Melt/cool- igneous rock 2) weather
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09 GEOS 1004 - GEOS 1004 SPOTILA Lecture 3 GEOLOGIC TOOLS I...

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