Cave
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Caves and caverns are natural voids under the surface of the Earth and have also been observed in other rocky worlds. Caves often form by the weathering of rock and can extend deep underground. Exogen
Lechuguilla Cave, New Mexico, United States
Speleothems in Hall of the Mountain King of Ogof Craig a Ffynnon, a solutional cave in South Wales.
Exploring a lava tube in Hawaii.
Painted Cave, a large sea cave, Santa Cruz Island, California
Lechuguilla Cave
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Lechuguilla Cave is a cave in Carlsbad Caverns National Park, New Mexico, United States, known for its unusual geology, rare formations, and pristine condition. At 152.11 miles, it is the ninth-longes
Cave
…The portions of a solutional cave that are below the water table or the local level of the groundwater will be flooded. Lechuguilla Cave in New Mexico and nearby Carlsbad Cavern are now believed to be examples of another type of solutional cave. They were formed by H2S (hydrogen sulfide…
Largest known gypsum stalactites, Chandelier Ballroom (human at bottom gives scale)