Antarctica’s size and remoteness had left many gaps in existing surveys. So scientists came up with a new kind of map. One result, revealed in 2019: the deepest canyon on Earth’s surface—nearly half as deep as Mount Everest is tall. ScienceMagArchives
As shown in the video above, the map uses the flow and volume of ice to infer the land below. It has revealed the deepest canyon on Earth's surface, plunging 3.5 kilometers below sea level under Denman Glacier in East Antarctica, nearly half as deep as Mount Everest is tall.
The uncovered terrain has mixed news for the future of Antarctica's ice: On the positive side, the map reveals a series of previously unknown ridges that sit above sea level in the deep valleys that drain the Transantarctic Mountains, which helps stabilizes the glaciers above and limits their potential ice loss. But at West Antarctica's, Thwaites, the news was not good: The glacier is grounded on a ridge below sea level, with a downward sloping basin behind it.
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