http://www.tmwmedia.com/physical_geography2.html
See an excerpt from this fascinating and beautiful title in the Physical Geography II series from TMW Media, which illustrates what water can do below the earth's surface, over long periods of time. Using animated and real life sequences, this program explores some important caves, their formations and teaches students how underground water dissolves limestone to form caves, caverns, stalagmites, stalagtites and boxfork formations.
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