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specifically a natural underground space large enough for a human to enter.Caves form naturally by the weathering of rock and often extend deep underground.These include flowstones, stalactites, stalagmites, helictites, soda straws and columns.These secondary mineral deposits in caves are called speleothems.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.relict; active caves have water flowing through them, relict caves to 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").

Such caves form in rock that is soluble; most occur in limestone, but they can also form in other rocks including chalk, dolomite, marble, salt, and gypsum.The portions of a solutional cave that are below the water table or the local level of the groundwater will be flooded.Caves formed at the same time as the surrounding rock are called primary caves.Lava tubes are formed through volcanic activity and are the most common primary caves.As lava flows downhill, its surface cools and solidifies.

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