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The age of discovery isn't over yet. A colossal canyon, the longest on Earth, has just been found under Greenland's ice sheet...
The great gorge meanders northward from Summit, the highest point in central Greenland, toward Petermann Glacier on the northwest coast, covering more than 460 miles (750 kilometers).
Researchers think the ravine could be even longer, but they don't yet have the data to prove where the canyon peters out deep under the interior ice sheet. "It may actually go farther south ..."
The broad chasm is up to 2,600 feet (800 meters) deep and 6 miles (10 km) wide, similar to America's Grand Canyon in scale, the researchers said. The distinctive V-shaped walls and flat bottom suggests water carved the buried valley, not ice, Bamber said. Though it is not the world's deepest canyon, it's the longest, handily besting the 308-mile-long (496 km) Yarlung Tsangpo Grand Canyon in China.
The great river channel could explain the missing lakes under Greenland's interior ice sheet. The weight of the ice sheet pushes down the island's middle into a bowl-shaped basin.
Given this saggy middle, scientists have long wondered why Greenland isn't filled with buried lakes, like Antarctica's Lake Vostok and Lake Whillans.
The northern part of the canyon may drain meltwater, but farther inland, Bamber and his colleagues think the massive weight of ice pushes water elsewhere.
And the newly discovered canyon could boost the breakup of one of the coastline's briskly retreating glaciers. The Greenland Grand Canyon dumps right into Petermann Glacier, which has dropped two massive icebergs in the past three years, each bigger than Manhattan.
Originally posted by angkory13
reply to post by Skywatcher2011
I tough there is to much more under ice around the world.