4680 x 3744 px | 39,6 x 31,7 cm | 15,6 x 12,5 inches | 300dpi
Date de la prise de vue:
12 novembre 2011
Lieu:
Kinder Scout, Derbyshire, Peak District National Park, England, UK
Informations supplémentaires:
This image is exclusive to Alamy. The circular holes in these rocks were made as a result of water flowing over them. The holes start as small cracks, perhaps caused initially through water expanding when it freezes. At some point a piece of grit will get trapped in the small crack and as the water flows over the rock the grit will about move in the crack. Slowly the grit scours away at the sides of the crack. As the crack enlarges more grit gets washed in increasing the action. At some point the hole becomes big enough that the flow of water over it causes a spinning movement. In time the crack becomes enlarged and circular and the grit is added to by small stones, which also spin in the current caused by the flowing water. Over thousands of years, as streams change their course, these rocks are left behind, pitted with circular holes.
