massive mystery holes have popped up in Russia

 

• Scientists don’t know what created the huge holes. But the recent spotting is the ninth one found since 2013.

• What causes the holes?

  Initial theories — which came out after one hole was discovered in the Yamal Peninsula in northwest Siberia — included “a meteorite impact, a UFO landing

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• Scientists now think the giant hole is connected to a blowup of methane gas, which would be the result of warming temperatures in the area.
• “Warming and thawing of surface soil weakens the frozen ‘cap,’ resulting in the blowout that causes the craters,” Sue Natali, Arctic program director at Woodwell Climate Research Center, told Gizmodo.