This document describes three main rock units: igneous rocks which form from cooling magma and can be intrusive, extrusive, or batholiths; metamorphic rocks which form from existing rocks undergoing heat and pressure changes leading to mineral changes with or without foliation; and sedimentary rocks which form through weathering, erosion, deposition, and lithification of sediments including clastic, organic, chemical types that may be cemented or stratified.

1. Rock Unit
Igneous
Intrusive extrusive batholith magmalava
Crystal size/cooling rate formation
Metamorphic
Foliated nonfoliated contact & regional
metamorphism heat pressure mineral
composition
Sedimentary
Weathering erosion deposition
compaction cementation clastic organic
chemical sediment conglomerate
stratisfication lithification