Arching over 8,849 metres (29,032ft) into the sky, Everest is the world’s tallest mountain. But will it always be?
Mount Everest is steadily growing taller at around 4mm per year while the forces of erosion wear away it
Over the next two months, researchers on the National Geographic and Rolex expedition she helped to organise would study the effects of climate change on this part of the Himalayas. Elmore, a geologist and at the time senior programme manager of the National Geographic Society in the US, supported the teamGliding closer to Everest's iconic peak, Elmore got a bird's-eye view of them.
Sikdar used trigonometry. He measured the horizontal and vertical angles of Everest's summit from other mountaintops whose positions and heights were already known. In doing so he made a momentous discovery: the tallest mountain ever recorded. According to his calculations, the mountain stood at Weather stations installed on Mount Everest were damaged by rocks the size of cricket balls that were picked up by the wind and it continued to grow. The collision between the two continental plates is still happening today. India continues to
Weather can also cause significant erosion to a mountain. Elmore describes one of the weather stations she helped install during the 2019 Mount Everest expedition as being "damaged by rocks the size of cricket balls that were picked up by the wind and thrown at it". Buffetting by debris and ice picked up by the wind takes its toll after a while.
In some parts of the world, entire landmasses are still rearing up after the last ice age – something known as, are rebounding after the rocky crust there was squashed by enormous continental ice sheets that waxed and waned during the Pleistocene. According to one study by researchers at Germany's University of Postdam, up tocan be explained by this surprisingly elastic response to the end of the ice age.
To gather millimetre-accurate results the instrument then has to record for several hours. In the thin air of Everest's "death zone", operating these instruments can be hazardous for surveyors. Members of a Nepalese expedition to take GNSS measurements on Everest in 2019– far longer than most who make their way there – after arriving at 03:00 in the pitch black and biting cold.
by the large earthquake, which killed 9,000 people and damaged hundreds of thousands of homes, but had not changed its height. Could Everest become a similar giant? In the 1980s, a researcher at the Cavendish Laboratory in Cambridge, UK, attempted to, taking into account the strength of gravity and the strength of the rock underlying the mountain.
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