Sunday, September 12, 2021

Beneath the Greenland Ice Sheet

 From Live Science:

The Greenland ice sheet hides the longest canyon in the world. Discovered in 2013, the canyon stretches 460 miles (740 kilometers) from the highest point in central Greenland to Petermann Glacier on the northwest coast. That's significantly longer than China's 308-mile-long (496 km) Yarlung Tsangpo Grand Canyon, the longest canyon on the planet that you can actually see. The canyon plunges up to 2,600 feet (800 m) deep in places and is 6 miles (10 km) wide. For comparison, the Grand Canyon in Arizona averages about 1 mile (1.6 km) deep and 10 miles (16 km) across. Parts of the canyon may route meltwater from beneath the ice sheet to the sea. It probably formed before the ice sheet and was once the channel for a mighty river. (Read more.)

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