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What's the difference between stalactites and stalagmites?

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  • Barrans, Richard. "Baking soda." Argonne National Laboratory - Division of Educational Programs.
  • Lyell, Charles. "The Student's Elements of Geology."
  • "Stalactite and stalagmite." The Columbia Encyclopedia, Sixth edition. Columbia University press, 2007.
  • "What is calcium carbonate?" Industrial Minerals Association - North America.