DR. MARLI MILLER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY DR. MARLI MILLER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY
When a stalagmite merges with a stalactite (left) it forms a column. On the right are a stalagmite and a stalactite that have grown very close to the point of merging. Carlsbad Caverns National Park, New Mexico, USA.
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