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.
How does Metamorphic rock form? Update: Deep underground, there is a lot of heat and pressure, This heat and pressure can change igneous and sedimentary rock into another type of rock called Metamorphic rock. Metamorphic rock often has layers that fold over one another. Marble and slate are metamorphic rock. These rocks are used in many buildings.