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To see how caves are formed, choose one of the four
cave-making agents below.
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Note: The illustration above is an idealized landform, used
to show how four different types of caves originate.
Sources: Caves, by David Gillieson (Blackwell
Publishers, 1996); The Science of Speleology, edited by T.D.
Ford and C.H.D. Cullingford (Academic Press, 1976);
Speleology: Caves and the Cave Environment, by George W.
Moore and G. Nicholas Sullivan (Cave Books, 1997); "Acid House" by
Stephanie Pain (New Scientist, June 6, 1998).
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