Reference Terms
from Wikipedia, the free encyclopedia

Cave

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.

Note:   The above text is excerpted from the Wikipedia article "Cave", which has been released under the GNU Free Documentation License.
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August 2, 2015

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