Cave
Channel: all the knowledge of the universe PRINCIPIA
Date: 2021-12-09

Cave, by Wikipedia https://en.wikipedia.org/wiki?curid=5778 / CC BY SA 3.0

#Caves
#Erosion_landforms
#Fluvial_landforms
Lechuguilla Cave, New Mexico, United States A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter.
Caves often form by the weathering of rock and often extend deep underground.
The word cave can also refer to much smaller openings such as sea caves, rock shelters, and grottos, though strictly speaking a cave is exogene, meaning it is deeper than its opening is wide, and a rock shelter is endogene.
Speleology is the science of exploration and study of all aspects of caves and the cave environment.
Visiting or exploring caves for recreation may be called caving, potholing, or spelunking.
The formation and development of caves is known as speleogenesis; it can occur over the course of millions of years.
Caves can range widely in size, and are formed by various geological processes.
These may involve a combination of chemical processes, erosion by water, tectonic forces, microorganisms, pressure, and atmospheric influences.
Isotopic dating techniques can be applied to cave sediments, to determine the timescale of the geological events which formed and shaped present-day caves.
It is estimated that a cave cannot be more than 3,000 metres （9,800 ft） vertically beneath the surface due to the pressure of overlying rocks.
This does not, however, impose a maximum depth for a cave which is measured from its highest entrance to its lowest point, as the amount of rock above the lowest point is dependent on the topography of the landscape above it.
For karst caves the maximum depth is determined on the basis of the lower limit of karst forming processes, coinciding with the base of the soluble carbonate rocks.
Most caves are formed in limestone by dissolution.
Caves can be classified in various other ways as well, including a contrast between active and relict: active caves have water flowing through them; reli...