Caves are deep hollow place in the rock side of hills or
cliffs. The larger one are called caverns. Some caves were formed by the Constance
beating of the sea waves against the rock. Some caves appeared under the surface
of the earth. These are usually the old course of underground streams, which
have worn away the soft rock, such as limestone. Atoll other were formed by the
valconic shifting of surface rock by eruption of hot lava. Some caves have
opening through their roofs, called sink holes. Some caves have galleries in
tiers or rows, one above the other. Then, here are those caves, which are
formed in the limestone where water percolates down, carring bits of lime,
which build into column called stalagmite.
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