In this world-parent separation myth, it is said that two gods, Quetzalcoatl (the Plumed Serpent) and Tezcatlipoca, pulled the earth goddess, Coatlicue (Lady of the Serpent Skirt), down from the heavens, took the form of great serpents, and ripped her into two pieces to form an animistic earth and sky.
In her earthly form, Coatlicue was the source of all nature. Her hair became plants; her eyes and mouth were caves and sources of water. Other parts of her body became mountains and valleys. Coatlicue, however, was angry at what had been done to her, and this is why she often demanded human hearts and human blood.