Here's why:

* Stalactites hang from the ceiling of a cave. They are formed when water containing dissolved minerals drips from the ceiling. As the water evaporates, the minerals are left behind, gradually building up a conical or icicle-like structure.

* Stalagmites are the formations that rise from the floor of a cave. They are formed by the dripping water hitting the floor, leaving behind minerals in a similar way as stalactites.

Let me know if you have more questions about cave formations!