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
Rock shelter
Videos
A rock shelter is a shallow cave-like opening at the base of a bluff or cliff.
Cave
…the weathering of rock and can extend deep underground. Exogene caves are smaller openings that extend a relatively short distance underground (such as rock shelters). Caves which extend farther underground than the opening is wide are called endogene caves. Speleology is the science of exploration and study of all…
The larger of the two Rockhouse Cliffs Rock Shelters
Rock shelter in the Little Carpathians
Dig of a Paleolithic site in the Zagros Mountains, Iran