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3c. Drippy wet stalactites | by kqedquest
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3c. Drippy wet stalactites

These pointy formations have the familiar look of cave stalactites, and indeed, they're formed in the same way. Rain that's fallen on the top of Alum Rock's mountains flows through rock layers, picking up minerals. Further down the mountain, the water flows out, depositing minerals as it drips to the ground. The "ceiling" it drips from develops pointy tips that focus the drops of water below them, creating the rounder lumps of rock pictured previously.

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Taken on November 26, 2007