Grabens and half-grabens, but not horsts, are formed at the edges of these features, one of which houses the world's deepest lake, Baikal.
One of these structures that "fails" forms an arm, called an aulacogen, of a larger structure. One of these features named for the river Rio Grande contains El Paso and Albuquerque. Three of these features meet to form a triple junction. Grabens and half-grabens, but not horsts, are formed at the edges of these features, one of which houses the world's deepest lake, Baikal. For 10 points, what geologic features, created by the separation of crust at the surface, are exemplified by a "great" African valley and series of lakes bearing their name?
One of these structures that "fails" forms an arm, called an aulacogen, of a larger structure.
rifts [accept rift valleys or rift lakes; accept triple junction before mentioned; prompt on fault]