Why Mount Everest is the world's tallest mountain
Briefly

Geologists suggest Mount Everest's height is partly due to the merging of two ancient rivers about 89,000 years ago, causing significant erosion and subsequent upward rebound.
The outer crust of the Earth responds to mass removal by rising, which has contributed to Everest's increase in elevation, according to geologist Matt Fox.
The Arun River's historical alteration and erosion through the Himalayas is key to understanding Everest's stature, acting in tandem with significant geological events.
The theory posits that the Arun River might have captured another river's course, dramatically affecting the landscape and contributing to the Himalayas' elevation.
Read at Nature
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