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Posted by msmash from the how-about-that dept.
The world’s tallest mountain is getting taller. Mount Everest, also known as Chomolungma, has grown about 15 to 50 meters (50 to 164 feet) higher over the past 89,000 years than expected, according to a modeling study released Monday. From a report: The culprit is a nearby river eroding and pushing down land, causing the ground under Mount Everest to rebound and lift. “It’s a new additional component of uplift of Mount Everest,” said Matthew Fox, study co-author and geologist at University College London. He expects this spurt of Everest and its surrounding peaks to continue for millions of years. He added “the biggest impact is probably on the climbers that have to climb another 20 meters or so to the top.” The additional height may also lead to the growth of more ice at the higher elevations.
Mount Everest, part of the Himalayan mountain range, towers along the Nepal-Tibet border at around 8,850 meters (29,000 feet) high. Not only is it the tallest worldwide, it leaves its surrounding peaks in the dust — rising around 250 meters above the next tallest mountain in the Himalayas, the 8,611-meter (28,251-foot) K2 mountain. But what could cause Everest’s anomalous height compared to its neighbors? These extra meters on Mount Everest can be chalked up to a relatively rare “river capture event” from 89,000 years ago, according to the authors’ computer models. During such an event, one river changes it course, interacts with another and steals its water, Fox said. In this case, the team said the Arun river network — about 75 kilometers east of Mount Everest — stole water from a river flowing north of Everest. Fox said the capture could have been initiated by a dramatic flood, which rerouted the water to a new drainage network. Today, the Arun River is a main tributary to the Kosi River to the south.
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