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What triggers rockfalls? Yosemite study shows it's about the heat

from The Mercury News

When rocks get hot, they do what people do: shed a few layers. And the hottest hours of the day — during the hottest months of the year — are prime time for unexplained rockfalls and cracking, according to a new study of the granite domes and cliffs in the Sierra Nevada, which finds that hikers, tourists and wildlife are at less risk of being flattened during cooler times from this mechanism. more

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