Speleothems: Carbonate precipitates forming within caves, including flowstones (formed at the base of flowing water), stalactites (from cave-roof drip sources), and stalagmites (from drip-water ...

William Whiskerson: They're stalac-tites. Emily: Yes. Narrator: Stalactites are formed by water dripping through the limestone in the cave roof. As each drip falls, it leaves tiny pieces of rock ...