Image: Shirburn Hill - geograph.org.uk - 110077
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Description: Shirburn Hill. Saucer-shaped depressions like these on hillsides in the Chilterns are very probably the result of freeze-thaw action at the end of the last Ice Age. The permanently frozen subsoil caused rain and meltwater to be trapped near the surface as it moved downhill, gradually eroding the surface.
Title: Shirburn Hill - geograph.org.uk - 110077
Credit: From geograph.org.uk
Author: David Ellis
Usage Terms: Creative Commons Attribution-Share Alike 2.0
License: CC BY-SA 2.0
License Link: https://creativecommons.org/licenses/by-sa/2.0
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