Initially believed to be a cold, arid grassland, the stretch more resembled the modern-day Yukon-Kuskokwim floodplain.
59m
Hosted on MSNScientists Can’t Explain This Perfectly Round Crater in Alaska—And It’s Been a Mystery for DecadesDeep in Alaska’s Katmai National Park, a perfectly round, 1,600-foot-wide crater has puzzled scientists for decades. Known as ...
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