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They where formed by vents of lave flowing through them making a tunnel or cave like shape!

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Antelope Canyon was formed by erosion of Navajo Sandstone, primarily due to flash flooding. They are considered very dangerous because if it starts raining all the water can go in there and fill up in a matter minutes .

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They where formed because of water, snow and ice eroding them over time! It is the oldest or bottom layer of the Grand Staircase, which makes up the North Rim of the Grand Canyon.