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cave 
Natural underground cavity that results from the slow dissolution and erosion of rock by water.
resurgence
Where an underground watercourse reappears at the surface after disappearing further upstream.
dry gallery
Underground corridor that forms when the water table drops.
stalagmite
Crystalline rock formation caused by the evaporation of water droplets that fall on the floor of the cave.
subterranean stream
Watercourse that flows through underground cavities.
column
Crystalline rock formation that results when a stalactite meets a stalagmite.
gour
Small basins hollowed out by water.
swallow hole
Deep hole connecting the ground surface to an underground gallery; it is caused by the collapse of the cave’s vault.
pothole
Natural well connecting a sinkhole to an underground swallow hole.
lapiaz
Calcareous rock surface with crests separated by grooves that are often deep; it is shaped by the water.
stalactite
Crystalline rock formation caused by the partial evaporation of water droplets from the vault of the cave.
sinkhole
Basin formed by continuous water infiltration into calcareous rock, causing the dissolution of the rock.
waterfall
Almost vertical flow of a watercourse, caused by a sudden change in the level of its bed.
gorge
Deep narrow ravine along which a permanent or intermittent river flows.
water table
Vast expanse of underground water fed by rainwater filtering through the earth; it supplies springs and can be collected in wells.
