Basics Easier - A cave is a large hole. It may be underground, in the side of a hill or mountain, or under a cliff. A cavern is a large cave.
Caves are natural shelters.
Animals often live in caves. A person who lives in a cave is called a cave dweller. During prehistoric times, cave dwellers painted pictures on the cave walls. Harder - A cave is an underground hollow or passage that is formed when water runs through an area with enough force to dissolve or wear away rock. These drops form rock sculptures that look like icicles called stalactites and stalagmites.