Caves are empty spaces inside the rocks, they have an entrance that allows communication with the surface and dimensions such that human entry is possible. Each cave can be completely or partially filled with sediments, that is, with materials brought there mainly by the erosion of rocks, by water or ice. When caves present a complex development – such as a combination of vertical shafts and horizontal chambers – they constitute cave systems.
The shape and size of caves varies greatly due to a large number of factors related to the structure and composition of the rock, the geometry of the cracks it presents, the relief of the area in which it is located, the hydrological conditions and many other factors of lesser importance.
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