FALLING BACK
During the past
10,000 years the Niagara Falls on the US-Canadian border, have been moving
upstream at an average rate of about 90m (295 ft) a century.
But geologists
estimate that it will take another 25,000 years at least before the Niagara
river cuts its way back to its source: Lake Eric, some 28km (17 miles)
away. When it finally breaks through the wall of the lake, the lake will
drain away... and the falls will disappear.
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