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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

You have an incredible responsibility as the chief of this country to take care of every single person, and you need to do better for everyone, Rapinoe added.Rapinoe has skyrocketed to national prominence for leading her team's undefeated run to win the World Cup on Sunday, championing the lawsuit filed by 28 US Women's National Team players demanding pay equal to the men's team -- and asserting that 404

While the project has support from the city council, a community group called the Encinitas Residents Coalition has sued to block the project. 142

While we deck the halls and trim the tree, we want to make sure our Hollywood Sign has a merry Christmas and a Happy New Year as well,"" Los Angeles City Councilman David Ryu said. ""These extra enforcements -- joining our existing enforcement around the sign -- will ensure the peace and safety of our iconic sign and its neighboring communities.""" 696

When the animals got too close for comfort, Broxton made the executive decision to bail and stashed his camera in his car.Once at a safer distance, Broxton shot video of the bison and you can see why he was so intimidated. They were large. The video of Broxton’s hilarious reaction has now become a meme, used when people are not happy with a situation.When Yellowstone park officials caught wind of the video, they 416