Limestone caves are formed when natural acids found in ground water dissolve limestone, a type of rock, leaving a cavern behind.
(Limestone caves; are formed; T:when natural acids found in ground water dissolve limestone) (natural acids; found; L:in ground water) (natural acids found in ground water; dissolve; limestone) (a type of rock; leaving; a cavern; behind)
Limestone caves natural acids natural acids found in ground water a type of rock
are formed found dissolve leaving
T:when natural acids found in ground water dissolve limestone
L:in ground water
limestone
a cavern behind