Variations in air pressure on the top of Mount Everest affect oxygen availability, changing the perceived elevation of the summit by hundreds of meters.
Mount Everest
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An Ice Core from the Roof of the World
An innovative National Geographic expedition collected the world’s highest ice core from Mount Everest.
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Glacial Outburst Flood near Mount Everest Caught on Video
More than 2 million cubic meters of water, hidden deep within Lhotse Glacier, spilled down toward the village of Chukhung, Nepal, in 2016.