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THE GIANT RIVERS OF ICE EVERY winter the moisture-laden winds from the Pacific, sweeping inland, cool suddenly upon the slopes of the great mountain and deposit there snow in enormous depths. Summer's sun melts only a portion of this snowfall. Thus are born the glaciers, for the snow under its own pressure quickly hardens into ice. Through twenty-eight valleys, self-carved, in the solid rock, flow these rivers of ice, now turning, as rivers of water turn, to avoid the harder rock strata, now roaring over precipices like congealed water falls, now rippling, like water currents, over rough bottoms, pushing, pouring relentlessly on until they reach those parts of their courses where warmer air turns them into rivers of water. There are forty-eight square miles of these glaciers.
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