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.
How do subduction zones make volcanoes? As the subducting plate plunges into the mantle, it becomes heated. When it reaches the asthenosphere or thereabouts, subducted water in the descending slab of crust lowers the melting temperature of the rock and a molten rock mixture forms.