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A Rare View Inside
Lava cools and hardens on the shore of Hawaii's biggest island. A core drilled more than 10,000 feet into the island has revealed just the sort of weak rocks that could serve as a surface for a gigantic landslide. The rocks are loose, ground-up glass still being made today when lava flows from a volcano to the ocean, is quenched there, and then ground and churned by waves.

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