Before revision: Grotte des Faux-Monnayeurs, Mouthiers-Haute-Pierre (France) Beam of sun inside the cavity of Rocca ill'Abissu, Fondachelli Fantina, Sicily Speleology is the scientific study of caves and other karst features, as well as their make-up, structure, physical properties, history, life forms, and the processes by which they form (speleogenesis) and change over time (speleomorphology).
After revision: Pirunkirkko (literally "devil's church") of Paistjärvi, a peak cave in Heinola, Päijänne Tavastia, FinlandGrotte des Faux-Monnayeurs, Mouthiers-Haute-Pierre (France) Beam of sun inside the cavity of Rocca ill'Abissu, Fondachelli Fantina, Sicily Speleology is the scientific study of caves and other karst features, as well as their make-up, structure, physical properties, history, life forms, and the processes by which they form (speleogenesis) and change over time (speleomorphology).