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This is Scientific American 60-Second Science. I'm Julia Rosen. Got a minute?

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Rocks are pretty tough, but eventually, even the mightiest mountains crumble.

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Geologists usually give the credit to water and ice.

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But when it comes to smashing summits, a major player may be electricity in the form of lightning.

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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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"I mean, these magnetic anomalies are huge."

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Susan Webb of the University of Witwatersrand in South Africa.

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"And so, we don't expect to see that, not with ice fracturing rocks.

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We would see that only with lightning fracturing rocks.

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And the fact that there's so many tells you that's a really important mechanism for weathering rocks."

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Webb presented her results on December 18th at the annual meeting of the American Geophysical Union in San Francisco.

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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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But Webb says she's only scratched the surface.

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"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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Then we'll be able to tell if this is a much more widespread phenomenon."

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Thanks for the minute, for Scientific American 60-Second Science. I'm Julia Rosen.

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