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.
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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.