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Black-and-white view of stalactites and stalagmites inside Carlsbad Caverns
EDITOR’S PICK

How Are Caves Formed?

Most familiar caverns form when mildly acidic groundwater dissolves soluble rock, especially limestone, along fractures and bedding planes. Flow enlarges openings into passages; later drainage exposes chambers where mineral-rich drips build stalactites and stalagmites.…

Oct 5, 2026 • 12 min readRead the discovery →
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New stories, explanations and research from Geology.