Cave

A or  is a natural void in the,  specifically a space large enough for a human to enter. Caves often form by the of rock and often extend deep underground. The word cave can refer to smaller openings such as s, s, and s, and they are called endogene caves. Caves which are deeper than its opening is wide are called exogene.

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.

Formation types
The formation and development of caves is known as ; 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 3000 m 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 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 by.

Caves can be classified in various other ways as well, including a contrast between active and relict: active caves have water flowing through them; relict caves do not, though water may be retained in them. Types of active caves include inflow caves ("into which a stream sinks"), outflow caves ("from which a stream emerges"), and through caves ("traversed by a stream").

Solutional
Solutional caves or karst caves are the most frequently occurring caves. Such caves form in rock that is soluble; most occur in, but they can also form in other rocks including , , marble, salt, and. Rock is dissolved by natural acid in groundwater that seeps through, , joints, and comparable features. Over time cracks enlarge to become caves and cave systems.

The largest and most abundant solutional caves are located in limestone. Limestone dissolves under the action of rainwater and groundwater charged with H2CO3 and naturally occurring s. The dissolution process produces a distinctive landform known as , characterized by s and underground drainage. Limestone caves are often adorned with formations produced through slow precipitation. These include s, s, s, s, s and columns. These secondary mineral deposits in caves are called s.

The portions of a solutional cave that are below the or the local level of the groundwater will be flooded.

in and nearby  are now believed to be examples of another type of solutional cave. They were formed by H2S gas rising from below, where reservoirs of oil give off sulfurous fumes. This gas mixes with groundwater and forms H2SO4. The acid then dissolves the limestone from below, rather than from above, by acidic water percolating from the surface.

Primary
Caves formed at the same time as the surrounding rock are called primary caves.

s are formed through activity and are the most common primary caves. As flows downhill, its surface cools and solidifies. Hot liquid lava continues to flow under that crust, and if most of it flows out, a hollow tube remains. Such caves can be found in the, , the basaltic plains of , and in other places. near, is a remarkably long and deep lava tube; it is 65.6 km.

Lava caves include but are not limited to lava tubes. Other caves formed through volcanic activity include rifts, lava molds, open vertical conduits, inflationary, blisters, among others.

Sea or littoral
Sea caves are found along coasts around the world. A special case is littoral caves, which are formed by wave action in zones of weakness in sea cliffs. Often these weaknesses are faults, but they may also be dykes or bedding-plane contacts. Some wave-cut caves are now above sea level because of later uplift. Elsewhere, in places such as Thailand's, solutional caves have been flooded by the sea and are now subject to littoral erosion. Sea caves are generally around 5 to 50 m in length, but may exceed 300 m.

Corrasional or erosional
Corrasional or erosional caves are those that form entirely by erosion by flowing streams carrying rocks and other sediments. These can form in any type of rock, including hard rocks such as granite. Generally there must be some zone of weakness to guide the water, such as a fault or joint. A subtype of the erosional cave is the wind or aeolian cave, carved by wind-born sediments. Many caves formed initially by solutional processes often undergo a subsequent phase of erosional or vadose enlargement where active streams or rivers pass through them.

Glacier
Glacier caves are formed by melting ice and flowing water within and under glaciers. The cavities are influenced by the of the ice, which tends to collapse the caves again. Glacier caves are sometimes misidentified as "s", though this latter term is properly reserved for bedrock caves that contain year-round ice formations.

Fracture
Fracture caves are formed when layers of more soluble minerals, such as gypsum, dissolve out from between layers of less soluble rock. These rocks fracture and collapse in blocks of stone.

Talus
Talus caves are formed by the openings among large boulders that have fallen down into a random heap, often at the bases of cliffs. These unstable deposits are called talus or, and may be subject to frequent s and s.

Anchialine
Anchialine caves are caves, usually coastal, containing a mixture of freshwater and saline water (usually sea water). They occur in many parts of the world, and often contain highly specialized and endemic fauna.

Physical patterns

 * Branchwork caves resemble surface dendritic stream patterns; they are made up of passages that join downstream as tributaries. Branchwork caves are the most common of cave patterns and are formed near s where occurs. Each passage or branch is fed by a separate recharge source and converges into other higher order branches downstream.
 * Angular network caves form from intersecting fissures of carbonate rock that have had fractures widened by chemical erosion. These fractures form high, narrow, straight passages that persist in widespread closed loops.
 * Anastomotic caves largely resemble surface braided streams with their passages separating and then meeting further down drainage. They usually form along one bed or structure, and only rarely cross into upper or lower beds.
 * Spongework caves are formed when solution cavities are joined by mixing of chemically diverse water. The cavities form a pattern that is three-dimensional and random, resembling a sponge.
 * Ramiform caves form as irregular large rooms, galleries, and passages. These randomized three-dimensional rooms form from a rising water table that erodes the carbonate rock with hydrogen-sulfide enriched water.
 * s (vertical caves, potholes, or simply "pits") consist of a vertical shaft rather than a horizontal cave passage. They may or may not be associated with one of the above structural patterns.

Geographic distribution
Caves are found throughout the world, although the distribution of documented cave system is heavily skewed towards those countries where caving has been popular for many years (such as France, Italy, Australia, the UK, the United States, etc.). As a result, explored caves are found widely in Europe, Asia, North America and Oceania, but are sparse in South America, Africa, and Antarctica.

This is a rough generalization, as large expanses of North America and Asia contain no documented caves, whereas areas such as the and parts of  contain many documented caves. As the world's expanses of soluble bedrock are researched by cavers, the distribution of documented caves is likely to shift. For example, China, despite containing around half the world's exposed limestone—more than 1000000 km2—has relatively few documented caves.

Records and superlatives

 * The cave system with the greatest total length of surveyed passage is in, US, at 676 km.
 * The longest surveyed underwater cave, and second longest overall, is in, Mexico at 335 km.
 * The deepest known cave — measured from its highest entrance to its lowest point — is in, , with a depth of 2,204 m. This was the first cave to be explored to a depth of more than 2 km. (The first cave to be descended below 1 km was  in France.) The  and  caves in Georgia, (1830 m, and 1753 m respectively) are the current second- and third-deepest caves. The deepest outside Georgia is  in Austria, which is 1,623 m deep.
 * The deepest vertical shaft in a cave is 603 m in in . The second deepest is Ghar-e-Ghala at 562 m in the Parau massif near  in.
 * The deepest underwater cave bottomed by a at 404 m, is the  in the.
 * The largest known room is, in the , a sloping, boulder strewn chamber with an area of approximately 700 by and a height of 80 m. The nearby  is believed to be the world's largest cave by volume, with a calculated volume of 3800000 m3. The largest room in a  is the  in the French.
 * The largest passage ever discovered is in the in  in, . It is 4.6 km in length, 80 m high and wide over most of its length, but over 140 m high and wide for part of its length.

Five longest surveyed

 * ,, US
 * /, Mexico
 * ,, US
 * , Mexico

Ecology
Cave-inhabiting animals are often categorized as s (cave-limited species), s (species that can live their entire lives in caves, but also occur in other environments), s (species that use caves, but cannot complete their life cycle fully in caves) and accidentals (animals not in one of the previous categories). Some authors use separate terminology for aquatic forms (for example, s, s, and s).

Of these animals, the troglobites are perhaps the most unusual organisms. Troglobitic species often show a number of characteristics, termed troglomorphic, associated with their adaptation to subterranean life. These characteristics may include a loss of pigment (often resulting in a pale or white coloration), a loss of eyes (or at least of optical functionality), an elongation of appendages, and an enhancement of other senses (such as the ability to sense vibrations in water). Aquatic troglobites (or stygobites), such as the endangered, live in bodies of water found in caves and get nutrients from detritus washed into their caves and from the feces of bats and other cave inhabitants. Other aquatic troglobites include cave fish, and s such as the and the.

such as Oligaphorura (formerly Archaphorura) schoetti are troglophiles, reaching 1.7 mm in length. They have extensive distribution and have been studied fairly widely. Most specimens are female, but a male specimen was collected from in 1969.

s, such as the and, are trogloxenes and are often found in caves; they forage outside of the caves. Some species of s are classified as trogloxenes, because they roost in caves by day and forage above ground at night.

Because of the fragility of cave ecosystems, and the fact that cave regions tend to be isolated from one another, caves harbor a number of endangered species, such as the, , and the gray bat.

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.

Cave entrances often have typical florae. For instance, in the eastern temperate United States, cave entrances are most frequently (and often densely) populated by the bulblet fern, .

Archaeological and cultural importance
Throughout history, primitive peoples have made use of caves. The earliest human s found in caves come from a series of caves near Krugersdorp and Mokopane in South Africa. The cave sites of, , B, , , Cooper's D, Gladysvale, Gondolin and Makapansgat have yielded a range of early human species dating back to between three and one million years ago, including ', ' and . However, it is not generally thought that these early humans were living in the caves, but that they were brought into the caves by carnivores that had killed them.

The first early hominid ever found in Africa, the in 1924, was also thought for many years to come from a cave, where it had been deposited after being predated on by an eagle. However, this is now debated (Hopley et al., 2013; Am. J. Phys. Anthrop.). Caves do form in the dolomite of the Ghaap Plateau, including the Early, Middle and Later Stone Age site of ; however, the caves that form along the escarpment's edge, like that hypothesised for the Taung Child, are formed within a secondary limestone deposit called. There is numerous evidence for other early human species inhabiting caves from at least one million years ago in different parts of the world, including ' in China at, ' in South Africa at the Cave of Hearths , ' and ' in Europe at ,  in Indonesia, and the in southern Siberia.

In southern Africa, early modern humans regularly used sea caves as shelter starting about 180,000 years ago when they learned to exploit the sea for the first time. The oldest known site is PP13B at. This may have allowed rapid expansion of humans out of Africa and colonization of areas of the world such as Australia by 60–50,000 years ago. Throughout southern Africa, Australia, and Europe, early modern humans used caves and rock shelters as sites for rock art, such as those at. Caves such as the in China were used for shelter; other caves were used for burials (such as ), or as religious sites (such as Buddhist caves). Among the known sacred caves are China's Cave of a Thousand Buddhas and the.

Caves and acoustics
The importance of sound in caves predates a modern understanding of acoustics. Archaeologists have uncovered relationships between paintings of dots and lines, in specific areas of resonance, within the caves of Spain and France, as well as instruments depicting paleolithic motifs, indicators of musical events and rituals. Clusters of paintings were often founds in areas with notable acoustics, sometimes even replicating the sounds of the animals depicted on the walls. The human voice was also theorized to be used as an echolocation device to navigate darker areas of the caves where torches were less useful. Dots of red ochre are often found in spaces with the highest resonance, where the production of paintings was too difficult. Here, singing is to be the most efficient way to explore caves.

Caves continue to provide usage for modern-day explorers of acoustics. Today provides one of the best examples for modern musical usages of caves. Not only are caves utilized for the reverberations, but for the dampening qualities of their abnormal faces as well. The irregularities in the walls of the Cumberland Caverns diffuse sounds bouncing off the walls and give the space and almost recording studio-like quality. During the 20th century musicians began to explore the possibility of using caves as locations as clubs and concert halls, including the likes of, , and. Unlike today, these early performances were typically held in the mouths of the caves, as the lack of technology made depths of the interior inaccessible with musical equipment. In, Virginia, a functioning has been developed that generates sound by mallets striking stalactites, each with a different pitch.

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