Northwest Territories Photos, Stock Photos of Canada, Yellowknife, Inuvik, Aurora Borealis, Northern Lights, Artic Circle pictures, NWT History, Pictures Canada - PhotosCanada.com Gallery

Northwest Territories Photos, Stock Photos of Canada, Yellowknife, Inuvik, Aurora Borealis, Northern Lights, Artic Circle pictures, NWT History, Pictures Canada

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Twin Gorge Falls, Northwest Territories, Canada 28

Twin Gorge Falls, Northwest Territories, Canada 28

Description : Some 100,000 years ago, North America has drifted to more or less its present position, much closer to the North Pole. Several ice ages have come and gone, and the most recent one is starting to retreat. During the coldest periods, great ice sheets had coated the continent right down to the central USA, somewhat like Greenland is today. As the climate changed and the ice melted, rivers carrying the melt water cut deep ravines into the fossilized reef, now positioned well above sea level. At locations where layers of the reef rock formations are harder than others, they resisted erosion by the river, and the waterfalls have formed. Some are small, on tiny tributary creeks; others are very large rivers, cascading over huge ledges.

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