What Is a Cave?

February 21, 2020
REINHARD DIRSCHERL—ULLSTEIN BILD/GETTY IMAGES

Caves are dark and hollow. They can form underground, on hillsides, or in the walls of cliffs. Some caves were carved out by water. Others were formed by lava that cooled and hardened.

Stalactites and stalagmites are sometimes found in caves. They are built up from the minerals in dripping water.

A person who explores and studies caves is called a spelunker. There is a lot to discover in this unique habitat!

REINHARD DIRSCHERL—ULLSTEIN BILD/GETTY IMAGES

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