A cave is a natural area or space under the surface of the Earth. You can find caves in any part of the world. People study how caves form and develop. Usually caves are formed because of water or volcanic forces. Caves often make up a system. It is so because they are connected with one another. Some animals prefer to live in caves. These are bats, fish, insects and spiders. Such animals can live in the dark as there’s no light in caves.

Historically people used caves to live there or to hide things there. In some cultures caves were used for ceremonies. Now people explore caves. This is a popular hobby. If a person explores caves, it’s called caving. Caving can be dangerous so it’s considered to be a risky sport. You see, caves can be very deep.