Caves


 * angel's hair
 * breakdown
 * breathing cave
 * calcite
 * canyon
 * cave pearl
 * caver
 * ceiling pocket
 * chimney
 * claustrophobia
 * column
 * conduit
 * crawl
 * crouchway
 * dome
 * domepit
 * dripstone
 * flowstone
 * fluting
 * gallery
 * glaciere
 * glaciospeleology
 * gour
 * grape
 * gypsum
 * karst
 * knee crawlers
 * lava tube cave
 * limestone
 * master cave
 * moon milk
 * pinched out
 * pitch
 * ponor
 * pothole
 * sink
 * sinkhole
 * sinkhole entrance
 * soda straw
 * speleology
 * spelunker
 * stalactite
 * stalagmite
 * sump
 * troglobite
 * troglodyte
 * troglophile