Sentences with phrase «massive subglacial»

Photojournalist Keith Heyward uses a dolly to film above a formation in the Dry Valleys known as the Labyrinth, a series of deep troughs and ridges that researchers believe was carved out in a massive subglacial flood roughly 12 million years ago.

Now a team of geologists has scoured that area to reveal a massive subglacial lake and a series of canyons, one of which — more than twice as long as the Grand Canyon — could rank as Earth's largest.