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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
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
White House attorney Ty Cobb told CNN that "out of respect for special counsel and his process," the White House does not comment on its communications with the special counsel. 177
When you have two races in a row it's important to keep that mental energy stable and I didn't really do that so all of the tools that I have that make me feel equipped to handle whatever pressure I feel I didn't have anymore. 226
Your official #RockHall2019 Inductees are here - welcome to the Hall of Fame: https://t.co/9aY5FO8gBH pic.twitter.com/YVep5m9r3f— Rock Hall (@rockhall) December 13, 2018 169
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