Glacially formed bowl-shaped hollows that open
downstream and are bounded upstream by a steep wall. Frost
wedging, glacial plucking, and abrasion all work to excavate
cirques from previously rounded mountaintops. Many cirques
contain small lakes called tarns, which are blocked by small
ridges at the base of the cirque. Cirques continue to grow during
glaciation, and where two cirques form on opposite sides
of a mountain, a ridge known as an arete forms. Where three
cirques meet, a steep-sided mountain forms, known as a horn.
The Matterhorn of the Swiss Alps is an example of a glacially
carved horn.
See also GLACIER.
Tidak ada komentar:
Posting Komentar
Catatan: Hanya anggota dari blog ini yang dapat mengirim komentar.