Why are the Alps getting taller?
Here's a conundrum: The African and European plates of the Earth's crust are no longer pushing into each other, but the Alps (created by the collision of those plates) are growing by about .05 in. per year. At first glance, those facts might make you question plate tectonics. But the real explanation is even weirder.
The Alps grow because they swim in the Earths mantle. Mountains like the Matterhorn or the Zugspitze lose one meter of stone every 1000-2000 years, Sauer reports. Like a melting iceberg slowly rises out of the water to adjust to the loss of weight, the alps rise according to their weight loss due to erosion. Sauer explains, that this was a hypothesis for years, but that it is proven now, because German scientists from the Research Center for Geoscience in Potsdam developed a new method to measure the erosion.
Original story is in German at Neue Zürcher Zeitung.
English summary from the Knight Science Journalism Tracker
Image courtesy Flickr user toprural, via CC
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Maggie Koerth-Baker
I do the Twitter, the Google+, and (to a much lesser extent) the Facebook.
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