Caves result below the surface--most caves are formed in limestone rock (Carlsbad Caverns, Mammoth Cave, etc.).
(most caves; are formed; L:in limestone rock) Context(most caves are formed,List([32, 53))):(Caves; result; below the surface)
most caves are formed,List([32, 53))
most caves Caves
are formed result
L:in limestone rock
below the surface