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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

Whitehead struggled during the Browns 24-19 loss to Denver, missing multiple tackles throughout the game, one of which led to a Broncos touchdown.A few moments after the team left the field, Whitehead allegedly began responding to tweets about his play on his account, @j2whitehead_.Some of the responses contained explicit language and racial slurs.< 354

Whether someone said 'I saw this occur, and I'm worried about this women? Or whether she was so violently assaulted that she ran for help and was at a rape crisis center reporting. We don't know, Monaco-Wilcox said. "The important thing now is to make sure she's protected through this process." 300

Who needs teeth when you have cats? This little lady at Advocate Children's Hospital skipped adulthood and just went straight to being an old cat lady. What they say about old people and babies looking alike has never seemed truer.... 234

With the weather conditions posing a potential fire risk, a Red Flag warning was scheduled to take effect Thursday at 5 a.m.10News previously reported that the Julian school closures were due to the SDG&E fire-related power outages. The article has been updated with the latest and correct information. 306