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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: “Modern Mexican cuisine”, including “creative” tacos, and “amazing” blackberry-jalape?o margaritas are the draw at this “hip, fun” cantina in Bankers Hill from Isabel Cruz; “sweet service”, reasonable prices and colorful Dia de los Muertos–themed decor complete the picture. 286

Witnesses described hearing a loud boom Thursday and moments later, finding victims, including construction workers, strewn throughout the wreckage. Other people were trapped in cars, they said.Giovanni Hernandez said it "sounded like a bomb, like multiple bombs in one.""It sounded like the world was ending, and when you look back, all you see is the bridge on the floor. It was awful," he told CNN affiliate WSVN. Sweetwater police Sgt. Jenna Mendez was stopped at a red light one intersection away when she saw the bridge crumble. At first, she thought, "Why would they have brought the bridge down during the day?"Mendez drove forward, saw crushed vehicles and realized "this was not on purpose, this was a catastrophe," she told CNN.She rushed into the debris and saw injured construction workers atop the detritus, she said.Two men had broken bones, and two others were unconscious -- one who wasn't breathing and the other with a major cut to this head. Mendez started chest compressions on the one who wasn't breathing, she said."I started yelling to civilians in the crowd, 'Please get me doctors. ... I need help up here.' A doctor jumped up, and she started helping," Mendez said.Doctors and medical students ran to the scene from a nearby building and started treating victims, said Isabella Carrasco, a student at the University of Miami who had passed under the bridge in a car just before the collapse.Carrasco saw at least five cars crushed beneath the bridge, she said."Someone on the side of the road had asked a police officer if she had heard any response from the people inside the car," Carrasco said, "and she shook her head and said no."Kendall Regional Medical Center received 10 patients, including two in critical condition, said Dr. Mark G. McKenney, the trauma medical director. 1808

Woods says keep looking even if nothing comes up at first."Keep searching for the job that's right for you," she says. "As soon as you find it, you'll know. And once you're in that position, the things you can learn can take you anywhere."  245

You may be having too little tax withheld from your paycheck. Change your withholdings now by filing a new Form W-4 with your employer. It could help you avoid having to scrape up money to pay a surprise tax bill next year, says Scott Stone, a certified public accountant with offices in Missouri and Arkansas. 330