buildingmaterial
aragonite
artificiallight
bedrock
calcite
calcium
calciumcarbonate
carbonate
carbonicacid
cave
cavern
caving
cement
concrete
coral
crystalform
curiousform
dissolution
eroded
erosion
foraminifera
geologicalfact
geology
groundwater
karst
karsticformation
lime
limestone
lit
mineral
namsongriver
nature
organicacid
potholing
rainwater
river
rockcolumn
sedimentary
solublerock
solutional
speleogenesis
speleology
speleothem
spelunking
stalactite
stalagmite
underground
water