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Karst or dissolutional: in limestone by the action of water. By far the majority.

Lava-tubes: left by lava running out from under the solidified crust of a lava flow.

Mass-movement: fissures behind a mass of rock peeling away from a cliff or hill-side.

Sea-caves: eroded in cliffs by wave action.

Talus Caves: rather stretching the definition of "cave" but these are still natural cavities -between rock-falls and the parent rock-face.

Rock-shelters: simply shallowcavities useable as sheltersin rock-faces, such as found in desert areas by scouring by wind-blown sand.

That's six out of the three you wanted... will that do?

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12y ago

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