Why some Alaskan rock glaciers race downhill while their neighbors barely move

PHYSorg
Sep 4, 2026, 12:20 pm98 ptsTrending
Two massive rock glaciers are creeping down mountain valleys in Alaska's Wrangell–St. Elias National Park. They sit only a few miles apart and formed under the same sky. One moves more than 5 feet (1.5 meters) a year. The other moves at less than half that pace.

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