The majority of caves on Earth are limestone caves that have been formed by rainwater and/or snowmelt. Waves, lava, and (in rare cases) a special type of bacteria that lives in extreme conditions can also create caves.
Back to all articles

The majority of caves on Earth are limestone caves that have been formed by rainwater and/or snowmelt. Waves, lava, and (in rare cases) a special type of bacteria that lives in extreme conditions can also create caves.