Yes, that is absolutely true! Stalactites are those beautiful, icicle-like formations that hang from cave ceilings. They are indeed formed by dripping groundwater.

Here's how it works:

1. Groundwater: Water seeps through the ground and dissolves minerals like calcium carbonate.

2. Dripping: This mineral-rich water drips from the cave ceiling.

3. Evaporation: As the water drips, it slowly evaporates.

4. Deposition: The dissolved minerals are left behind, building up over time and forming the stalactite.

It's a slow process, but over hundreds or even thousands of years, these impressive structures can grow quite large!