Which feature is more likely to be rounded on the upper end than a stalactite?

A stalagmite is formed from mineral deposits that accumulate on the ground of a cave as dripping water from above loses carbon dioxide and precipitates. While stalagmites can have various shapes, they typically have a broad, rounded top when they are fully developed, especially compared to stalactites, which are often elongated and taper downwards.

The question asks for a feature that is more likely to be rounded at the upper end than a stalactite. A stalagmite's formation process allows for a more rounded and bulbous top due to the continuous deposition of minerals, which builds up from the cave floor, creating a dome-like structure.

Cave pearls, columns, and flowstones do not inherently have a rounded upper end like stalagmites. Cave pearls are small, round formations that develop in pools but their entire structure is not as tall or rounded as a stalagmite. Columns, formed when a stalactite and stalagmite grow together, can have a combination of shapes but not all columns exhibit a distinctly rounded top. Flowstone is a sheet-like formation that is typically flat and would not be rounded either.

Thus, the stalagmite stands out as the feature that more often has a rounded upper end compared to stal