Chorea is an abnormal involuntary movement disorder, one of a group of neurological disorders called dyskinesias. The term chorea is derived from the Ancient Greek: ÏÎ¿ÏÎµÎ¯Î±, as the quick movements of the feet or hands are comparable to dancing. The term hemichorea refers to chorea of one side of the body, such as chorea of one arm but not both.
Metamorphic rocks are most likely found at a site that is  deep under ground. Metamorphic rocks are formed by other materials  under great amounts of pressure. This pressureâ¦ is caused by plate  collisions in the lithosphere.
Rocks and the Rock Cycle. 1  Metamorphic Rocks-Metamorphic rocks are formed by great heat and pressure. 2  They are generally found inside the Earth's crust where there is enough heat and pressure to form the rocks. 3  Metamorphic rocks are often made from other types of rock. They are generally found inside the Earth's crust where there is enough heat and pressure to form the rocks. 2  Metamorphic rocks are often made from other types of rock. 3  For example, shale, a sedimentary rock, can be changed, or metamorphosed, into a metamorphic rock such as slate or gneiss.