Hoodoos are defined as tall rock formations that have "totem-pole shaped bodies", meaning they have thick and thin widths in the same formation (Bryce Canyon National Park, para 13). Height varies from one hoodoo to another, as they can be as small as a person or tower as tall as ten stories (para 14). The Zion National Park website says that the hoodoos of Bryce Canyon began forming 60 million years ago, and were produced by marine, lacustrine, and fluvial water force.
[...] Frost wedging caused the rock to separate along vertical joints and is the reason the hoodoos stand apart from the canyon walls. First, water seeped into the cracks and froze, expanding and forcing the crack to widen. Even after the ice melted, the wedge was still there. The wider crack allowed even more water to enter. Through this cycle, the hoodoos were gradually split away from the canyon wall. Because Bryce Canyon has freezing temperatures 360 days out of the year, there is a constant opportunity for frost wedging (Zion National Park, para 3). [...]
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