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1 .This is Scientific American 60-Second Science. I'm Julia Rosen. Got a minute?
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2 .Rocks are pretty tough, but eventually, even the mightiest mountains crumble.
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3 .Geologists usually give the credit to water and ice.
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4 .But when it comes to smashing summits, a major player may be electricity in the form of lightning.
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5 .Scientists have found evidence for lightning's role in mangling mountains in the magnetic signatures of rocks, which go haywire when blasted by bolts.
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6 ."I mean, these magnetic anomalies are huge."
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7 .Susan Webb of the University of Witwatersrand in South Africa.
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8 ."And so, we don't expect to see that, not with ice fracturing rocks.
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9 .We would see that only with lightning fracturing rocks.
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10 .And the fact that there's so many tells you that's a really important mechanism for weathering rocks."
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11 .Webb presented her results on December 18th at the annual meeting of the American Geophysical Union in San Francisco.
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12 .As a test case, she studied the magnetic signatures of rocks in the southern African country of Lesotho, a place with lots of mountains and lots of lightning.
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13 .But Webb says she's only scratched the surface.
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14 ."And I think as we look more and more for this, and it's very easy to look for if we do magnetic surveys in these areas, we will see it.
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15 .Then we'll be able to tell if this is a much more widespread phenomenon."
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16 .Thanks for the minute, for Scientific American 60-Second Science. I'm Julia Rosen.
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