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When the lithosphere is subject to a horizontal extensional force it will stretch, becoming thinner. Eventually, it will rupture, leading to the formation of a rift valley.This process is accompanied by surface manifestations along the rift valley in the form of volcanism and seismic activity. Rifts are the initial stage of a continental break-up and, if successful, can lead to the formation of a new ocean basin.An example of a place on Earth where this has happened is the South Atlantic ocean, which resulted from the break up of South America and Africa around 138m years ago -- ever noticed how their coastlines match like pieces of the same puzzle?Continental rifting requires the existence of extensional forces great enough to break the lithosphere. The East African Rift is described as an active type of rift, in which the source of these stresses lies in the circulation of the underlying mantle. Beneath this rift, the rise of a large mantle plume is doming the lithosphere upwards, causing it to weaken as a result of the increase in temperature, undergo stretching and breaking by faulting.Evidence for the existence of this hotter-than-normal mantle plume has been found in geophysical data and is often referred to as the "African Superswell."This superplume is not only a widely accepted source of the pull-apart forces that are resulting in the formation of the rift valley but has also been used to explain the anomalously high topography of the Southern and Eastern African Plateaus. 1506

Zagat says: Open since 1940, this local “landmark” in Mission Hills is “always dependable” for “pretty darn good Mexican food” like tacos on “fresh tortillas”, “awesome tamales” and some of the “best chips in town” all at “amazing prices”; the counter-service space is “nothing fancy”, so eating outdoors on the patio “is the way to go.” 337

While they replace the pipe, Frost Street will be closed to traffic, and there will be delays on Health Center Drive, as one lane of traffic will be shut down. 159

Zimmer also said many guests who find out about the Hilton’s holiday project are excited at the prospect of taking part in the display. 135

While the survivors are fighting for new legislation hundreds of miles from home, their slain friends and teachers aren't far from their thoughts. 146