As the water descends along fracture openings and through thin separations between rock layers, the weakly acidic groundwater slowly dissolves portions of the limestone, eventually forming subterranean cavern systems that can have complex links back to the land surface.
(the water; descends; along fracture openings and through thin separations between rock layers) (the weakly acidic groundwater; slowly dissolves; portions of the limestone; T:As the water descends along fracture openings and through thin separations between rock layers) (subterranean cavern systems; can have back; complex links)
the water the weakly acidic groundwater subterranean cavern systems
descends slowly dissolves can have back
along fracture openings and through thin separations between rock layers
portions of the limestone T:As the water descends along fracture openings and through thin separations between rock layers
complex links