Page "Stalactite" Paragraph 8
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Eventually, these rings form a very narrow ( 0. 5 mm ), hollow tube commonly known as a " soda straw " stalactite.
If they become plugged by debris, water begins flowing over the outside, depositing more calcite and creating the more familiar cone-shaped stalactite.
The same water drops that fall from the tip of a stalactite deposit more calcite on the floor below, eventually resulting in a rounded or cone-shaped stalagmite.
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