Lab 3 notes - 1 Difference between minerals and rocks A...

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1. Difference between minerals and rocks: A mineral is a naturally occurring, homogenous substance with a defined chemical composition. A rock , by comparison, is an aggregate of minerals and need not have a specific chemical composition. 2. Three groups of rocks: Igneous rock : forms when magma or lava cools and solidifies, either below ( intrusive ) or above the earth surface ( extrusive ); Sedimentary rock : forms from the lithification of sediments, either clastic (formed from rock fragments), biogenic (formed from hard parts of buried animals and plants) or chemical precipitated; Metamorphic rocks : forms when pre-existing rock is subject to high temperature and/or pressure and recrystallized. 3. Rock cycle : Conceptual model that explains how the various types of rocks from, deform and transform by natural processes. Igneous rocks: formed at the divergent and convergent plate boundary; Sedimentary rocks: generally formed at quiet seafloor, no plate tectonic requirement; Metamorphic rocks: in the high pressurized area like mountain belts (convergent boundary) or around high-temperature magma (divergent boundary).
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