Caves are underground passages and are created through a combination of chemical,water and pressure.
The majority of caves are found in limestone areas sometime,water only drips very slowly and gradually eats away at the limestone.
This creates an underground hole or cave.
some caves are formed by a hygrogon gas coming from deep below the Earth.
Other caves are sea caves.
The waver pound the coastline,eroding weak areas in the rock.
In limestone caves,unique features called stalactites and stalagmites can be found.