Crag
A crag ( craig in Scots, and sometimes written cragg ), is a rock hill, or a mountain, often isolated from the others. The crags were formed when a Glacier or a layer of ice came to be posed on a piece of hard stone (often granitic or of volcanic origin ). The force of the glacier eroded the most tender materials around this hard stone, letting the block of hard stone exceed level of the surrounding ground.
Often the crag was used as shield with tender materials being in the wake of the Glacier. That creates with dimensions one protected from the glacier, one stops, forming a slope finishing at a peak called the tail ( tail in English).
In other cases, for example when the crag was found surrounded by the sea, the tail often absent, is eroded by a postglacial erosion.
One finds examples of crags and tails with:
- Edinburgh, the hill on which on which the castle is built.
- Stirling, where one counts three of them, in and outside the city, including the hill of the castle.
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