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更新日期：2019-06-11
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The cave is a cavity in the upper part of the earth's crust that communicates with the surface with one or several inlet apertures. Another definition a cave is a natural underground cavity accessible to human infiltration having non-sunlighted parts and a length greater than the other two dimensions. The largest caves are complex systems of passageways and halls often with a total length of up to several tens of kilometers.
Caves the object of studying speleology. A considerable contribution to the study of caves is made by speleotourists. Exploration of artificial and underground structures is covered by caving.
Caves in the entrance part with suitable morphology and location were used by ancient people as comfortable dwellings. Cave dwellings with combinations of signs which define their outstanding universal value according to the Convention of the World Cultural and Natural Heritage to be included in the UNESCO World Heritage List the original fund of outstanding monuments of culture and Nature, the main purpose of which is to attract the forces of the world community to preserve these unique objects.
Cool 3D Pics HD Wallpapers - Good Download Free Pictures - Cave Wallpaper Backgrounds for Mobile Phones.
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