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.
4. This occurs as the result of heat and pressure changes in the chemical environment and causes changes in the mineral compositions and crystalline textures of pre-existing rocks. 7. This type of metamorphism occurs over a wide area and is caused by deep burial or strong tectonic forces of the Earth.