SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Weathering and erosion. View of part of Bryce Canyon, showing the pinnacles formed by many millennia of erosion and weathering. The canyon was formed by the erosive power of a river, cutting into the rock as it was uplifted. The exposed rock faces and internal faults were then weathered, creating these bizarre pinnacles. The main weathering process was 'freeze-thaw'. Water from occasional rain or dew found its way into cracks in the rock. When the water froze, it expanded and broke parts of the rock away. After a thaw, the water could find its way into other cracks. The canyon is largely made of banded sandstone sediments, and is in Utah, USA.
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