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A '''cave''' is an air- or water- filled void beneath the ground, where there is insufficient rock to prevent (but not inhibit, or many [[caver]]s would lack challenges) human access.
A '''cave''' is an air- or water- filled void beneath the ground, where there is insufficient rock to prevent human access.
They can be formed by
They can be formed by
*acidic rainwater, often weak [[carbonic acid]], eroding away large of rocks such as [[limestone]].
*[[acid rain|acidic rainwater]], eroding away large of rocks such as [[limestone]].
*[[lava]] cooling and solidifying - either in bubbles, or when the crust of a lava flow solidifies, while the still-liquid lava underneath moves on.
*[[lava]] cooling and solidifying - either in bubbles, or when the crust of a lava flow solidifies, while the still-liquid lava underneath moves on.
*[[waves]] - on coasts, waves can pound out caves in cliffs.
*[[waves]] - on coasts, waves can pound out caves in cliffs.
*[[erosion]] from wind or water
[[Category:Geography]]
[[Category:Geography]]