Podcast:Moment of Um Published On: Fri Feb 14 2025 Description: Caves are full of amazing stuff: bats, hidden passageways and of course – spectacular rock formations! So where do these rock structures come from? We asked geologist Hazel Barton to help us find the answer.Got a rock-solid question?Send it to us at BrainsOn.org/contact, and we’ll help find the answer under the surface.