Image: Citadel Sink Wupatki National Monument
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Description: Citadel Sinkhole at Wupatki National Monument, with the San Francisco Peaks in the distance looking southwest. The sinkhole is formed by acidic rainwater seeping through cracks in the surface. The rain dissolved the limestone below, causing the ground to collapse above. It is around 600 feet in diameter.
Title: Citadel Sink Wupatki National Monument
Credit: Own work
Author: Milonica
Usage Terms: Creative Commons Attribution 4.0
License: CC BY 4.0
License Link: https://creativecommons.org/licenses/by/4.0
Attribution Required?: Yes
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