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Formations in Limestone
Caves
The author organizes the ideas in this
passage by
comparing and contrasting the
formation of limestone caves and other
kinds of caves
Most caves are formed in limestone,
a type of rock that easily dissolves
over time. Caves form when
rainwater seeps through cracks in the
limestone. Sometimes, the water
drips down through cracks. Other
times, the water gushes. Over a long
period of time, the limestone wears
away, leaving a large empty space
called a cave.
telling how stalactites and stalagmites
are alike and different
explaining how limestone caves form
and why they are important
explaining why stalactites and
stalagmites are a problem and telling
how to solve it