Caves Wallpaper, #10881

A cave is a natural underground void large enough for a human to enter. Some people suggest that the term cave should only apply to cavities that have some part that does not receive daylight; however, in popular usage, the term includes smaller spaces like sea Caves, rock shelters, and grottos.Speleology is the science of exploration and study of all aspects of Caves. Exploring a cave for recreation or science may be called caving, potholing, or occasionally (only in Canada and the United States), spelunking (see Caving).The formation and development of Caves is known as speleogenesis. Caves are formed by various geologic processes. These may involve a combination of chemical processes, erosion from water, tectonic forces, microorganisms, pressure, atmospheric influences, and even digging.Caves are visited by many surface-living animals, including humans. These are usually relatively short-lived incursions, due to the lack of light and sustenance.