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.
Metamorphic rocks form from preexisting rocks (either igneous, sedimentary, or other metamorphic rocks) that have been altered by the agents of metamorphism, which include heat, pressure, and chemically active fluids. During metamorphism some of the material must remain solid.igmatites, fall into a transition zone somewhere between. âtrueâ igneous rocks and âtrueâ metamorphic rocks. I. Metamorphism A. The transformation of one rock into another by temperatures and/or pressures unlike those in which it formed B. Metamorphic rocks are produced from 1. Igneous rocks 2.