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.
A metamorphic rock cannot change into a igneous rock. A igneous rock is formed when magma solidifies into a solid state. A metamorphic rock is formed when another rock experiences extreme pressure under the earths crust. You cannot change a metamorphic rock back into a igneous one it is the other way around.