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.
Converging crustal plates. Subduction areas develop when a continental crust converges with an oceanic crust. The heavier oceanic crust bends and begins moving downward toward the upper mantle. Recent studies indicate that the subducting plate is pulled downward by gravity.