Photographer: Calvin J. Hamilton Copyright: © 2008 Calvin J. Hamilton Date: 2008/12/13 Location: Koko Crater, Oahu, Hawaii

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Caption

Koko Crater, Hawaii shows signs of extensive gully erosion. The crater is about 400 meters (1,320 feet) high. Erosion primarily by surface water flow and sapping close to the summit has produced valleys that are 3-5 meters deep.