Answer: Heidi Doody. Heidi Doody was built by Margo Rose and had the voice of Norma MacMillan and Donna Miller. Heidi was introduced as a stranger who saved Buffalo Bob's life in Africa. Later, Heidi was adopted and became Howdy's sister.
The descending of rock layers at subduction zones causes metamorphism in two ways; the shearing effect of the plates sliding past each other causes the rocks coming in contact with the descending rocks to change. Some of the descending rock will melt because of this friction.
The process of metamorphism is one that changes or alters either the mineralogy or the texture, but typically both, of some pre-existing rock. Metamorphic rocks are consequently rocks that have undergone a change or metamorphosis from a previous state as a sedimentary, igneous or even another metamorphic rock.