The answer isCavernsas Caverns of limestone is a natural cavity, which forms in the subsurface of the earth by the effect of acidic groundwater and underground water (like rivers) making the limestone dissolve by time and leaves this cavity. which increase and grow up with time.and there are many structures which form in this caverns ex :(Speleothem, Stalactite, Flowstone, Stalagmite, Helictite)...

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