A cave is a natural underground void large enough for an adult human to enter.
Some scientists stipulate that it must be large enough that some portion of it will not receive daylight; however, in popular usage, the term includes smaller spaces like cliff cavities, rock shelters and sea caves.
For more information about the topic Cave, read the full article at Wikipedia.org, or see the following related articles:
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Note: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Cave at Wikipedia.org. See the Wikipedia copyright page for more details.
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