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

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

Geologists usually give the credit to water and ice.

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

Scientists have found evidence for lightning's role in mangling mountains in the magnetic signatures

of rocks which go haywire when blasted by bolts.

I mean, these magnetic anomalies are huge.

Susan Webb of the University of Vitwatersrand in South Africa.

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

We would see that only with lightning fracturing rocks.

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

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

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.

But Webb says she's only scratched the surface.

And I think as we look more and more for this, and it's very easy to look for it.

If we do magnetic surveys in these areas,

...