Rocks. ESCI 1214 Fall 2006 NOC-Stillwater. What are rocks?. Rocks are aggregates of minerals They can form from several different processes There are three (3) main types: Igneous Sedimentary Metamorphic. Igneous Rocks.
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(fine-grained, cools quickly at the surface)
(coarse-grained, cools slowly at depth)
Pic from ksu.edu/geol
The Bowen’s Reaction Series helps identify the minerals one would expect in a certain rock type. In addition, it helps predict the stability of each rock type and mineral at the earth’s surface
Once rocks are exposed to the surface, the weathering process begins. Weathering breaks rocks down followed by transportation, deposition and lithification forming sedimentary rocks.
Pic from minoscam.org
Example of metamorphic rock formation. We will be more concerned with the regional and contact metamorphism types.
Regional metamorphism involves extreme pressure with some heat over a large area
Contact metamorphism involves extreme heat over a localized area
Pic from indiana.edu
The Rock Cycle is a continuous process that changes old rock, creates new rock and recycles rock