2.  Metamorphism is the changes in a rock that result in the formation of metamorphic mineral assemblage.  Metamorphic rocks may have foliation in response to temperature and/or pressure, application of differential stress, and hydrothermal fluids.

3.  Metamorphism involves phase changes, recrystallization, neocrystallization, pressure solution, and/or plastic deformation.  Hot water can also bring in and remove elements.

4.  Foliation is the alignment of crystals or the mineral orientation. It often has compositional banding.  Occurs where differential stress causes the compression and shearing of a rock. Inequant crystals align parallel to one another.

5.  Classes of metamorphic rocks include foliated and non-foliated rocks.  Class depends upon foliation.

6.  Foliated rocks include: slate, phyllite metaconglomerate, schist, and gneiss.  Non-foliated rocks include: hornfels, quartzite, and marble.  Migamite is a mixture of igneous and metamorphic rock.

7.  Low-grade rocks are those that form under relatively low temperatures.  High-grade rocks form under high temperatures.  Intermediate rocks form between the two extremes.

8.  Index minerals are used to track the distribution of different grades of rocks.  Points where index minerals first appear are called isograds.  A metamorphic zone exists between two isograds.

9.  Metamorphic facies is a group of metamorphic mineral assemblages.  They develop under a specified range of temperature and pressure conditions.

10.  Contact metamorphism occurs in an aureole surrounding an igneous intrusion.  Burial metamorphism occurs at depth in a sedimentary basin.  Dynamically metemorphosed rocks form along faults and often undergo plastic shearing.  Hydrothermal metamorphism is caused by circulation of hot water.  Shock metamorphism is from an impact of a meteorite.

11.  Metamorphic rocks can be found in mountain ranges.  Blueschist forms in accretionary prisms.  Precambrian metamorphic rocks can give way to shields.