acid
calcium carbonate, carbonate rocks, cause, cave, cave in, cavity, characteristic, chasm, chemicals, collapse, collapse
danger, detection, development, disappear, dissolution, doline, drainage
engulfed
fear, fill, fissure, Florida, formation, fragility
geologist, geology, gradually, ground, ground water
happen, history, hole, hole, horror
intrusion
karsification, karst
land form, limestone, locations
occurrence
perforation, pit, porous, pothole, process
rainfall, rains, reaction, region, reshaping
sandstone, scare, sinkhole, size, soil, springs, sudden, surface, susceptiblity, swallet, swallowed
tragedy, trigger
underground, unexpected, unknown, unpredictable
vibrations, visible, void
water table, weather, weight
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