Bryce Canyon is not a "real" canyon. It is not carved by flowing water. Water is the active ingredient here but in the form of "frost-wedging" and chemical weathering.
For 200 days a year the temperature goes above and below freezing every day. During the day, melted water seeps into fractures only to freeze at night, expanding by 9%. Now as ice, it exerts a tremendous force (2,000 - 20,000 pounds per square inch). Over time this "frost-wedging" shatters and pries rocks apart. In addition, rain water, which is naturally acidic, slowly dissolves the limestone, rounding off edges and washing away debris.
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