Canada: The Galloping Glacier

As chief pilot for the U.S.-Canadian Icefield Ranges Research Project, Phil Upton had for years stared down from his plane at the billions of tons of antediluvian ice frozen onto the east slope of Mount Steele in Canada's Yukon Territory. Perhaps 20,000 years old, it looked much the same as any other glacier—until six weeks ago, when Upton gazed down and did a double take. To his astonishment, Steele Glacier's normally mirror-smooth surface now was churned into cathedral-like spires 250 ft. tall. The huge chunk of ice was on the move.

By last week Steele had been nick named "the...

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