The stone in Zion National Park is mainly sedimentary, which is stone formed from loose sediment at the bottom of a lake or ocean that hardened into rock. This type of rock is particularly vulnerable to water erosion. Over the centuries, flooding from rainstorms has carved channels and caves into the rock of the area that became Zion National Park.|||that's like saying that why is the world round ok but I'm gonna guess it had something to do with the plates moving that caused the formation of the caves, or I'm pretty sure it had something to do with the earth doing something to form caves

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