Limestone is a sedimentary rock created by layers of ... Over time, this builds up to create the long, thin deposits that look like icicles hanging from the top of the cave. They’re the stalactites.

Different plate tectonic settings produce distinctive basin environments where sedimentary ... be sure to look at the diagrams on the right side of the page, and click the links for each stage to see ...

They look a bit like geodes, but they’re not exactly geodes. There are three types of rock: igneous, metamorphic, and ...

Limestone is a sedimentary rock made up of bits of animal shells ... form called stalactites and stalagmites. The stalactites look like spiked up hair turned upside down and were formed by water ...