A slender, downward growing pinnacle that hangs from a cave roof is a
Answer Details
A slender, downward growing pinnacle that hangs from a cave roof is called a "stalactite". Stalactites are formed by the deposition of calcium carbonate and other minerals that are left behind by water droplets that fall from the ceiling of a cave. As the water evaporates, it leaves behind tiny amounts of minerals that slowly build up over time, forming the long, slender structures that we call stalactites.