Description: A cave is defined as any cavity in the ground that has a section which does not receive direct sunlight. A cavern is just one type of cave which is formed naturally in soluble rock and grows speleothems (the general term for cave formations like stalagmites and stalactites). Cavern speleothems are naturally beautiful objects of nature and so, many caverns are turned into tourist attractions worthy of road trips. Many people enjoy visiting caves. Most take commercial cave tours, but some people enjoy exploring wild caves. These people are called cavers or spelunkers. They know that caves can be dangerous, so they wear hard hats to protect their heads. They always carry three sources of lights, so that they don't get lost in the dark. They are always careful not to damage the fragile cave environment, and so protect the beautiful calcite deposits and tiny animals. Respecting the cave, they also respect people and always get permission before visiting a cave. People can get permission to explore caves in state parks by applying for a cave permit. Some people that go into caves do not follow the rules, and it is easy to see the damage that they do. Organized cavers have a motto: Take nothing but pictures, leave nothing but footprints, kill nothing but time; a good motto for many other activities too.