Tarn (lake)

[3] Similarly, in Scandinavian languages, a tjern or tjørn (both Norwegian) or tjärn or tärn (both Swedish) is a small natural lake, often in a forest or with vegetation closely surrounding it or growing into the tarn.

[4] Nonetheless, there are many more bodies of water called 'tarn' in the Lake District than actually fit this technical use.

The Scots language word shon/shun ("a small loch") may too be derived from Old Norse tjørn, perhaps under the influence of sjø ("sea; fresh water lake").

Eventually, the hollow in which a cirque glacier develops may become a large bowl shape in the side of the mountain, caused by weathering, by ice segregation, and as well as being eroded by plucking.

[6][7] A cirque typically will be partially surrounded on three sides by steep cliffs, with a fourth side a form of moraine constructed from glacial till, which forms the lip, threshold or sill,[8] from which either a stream or glacier will flow away from the cirque.