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Caves

Cave
Natural void under the Earth's surface
Cenote
Natural pit or sinkhole that exposes groundwater underneath
Karst
Topography from dissolved soluble rocks
Lava tube
Natural conduit through which lava flows beneath the solid surface
Sinkhole
Depression or hole in the ground caused by collapse of the surface into an existing void space
Solutional cave
Cave formed in soluble rock such as limestone, chalk, dolomite, marble, salt beds or gypsum
Speleothem
A structure formed in a cave by the deposition of minerals from water
Stalactite
Elongated mineral formation which hangs down from a cave ceiling
Stalagmite
Elongate mineral formation found on a cave floor