Alpine Glaciers. Ice that flows down mountain valleys (e.g. in the Alps!). Mont Blanc, near Chamonix, France - note the alpine glacier that flows to lower elevations, nearly reaching the main valley in which Chamonix lies. Bergschrund at head of a glacier above Chamonix.
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Ice that flows down mountain valleys
(e.g. in the Alps!)
Bergschrund at head of a glacier above Chamonix
Mer de Glace above Chamonix - note ogives
Rockfalls from the valley walls add debris to the glacier’s surface
Glaciers are capable of carrying debris of almost any size - from the fine particles embedded in the ice in the foreground, to the huge angular boulder in the background
Landforms of Alpine Glaciation
Cirques, Aretes, Horns
Fjord - a glacially eroded valley invaded by the sea
Cirques are high basins where alpine glaciers originate
The Grand Teton (WY) is a classic horn - note several small cirques that have eroded into the mountain, leaving only a fairly narrow, jagged peak.
Iceberg Lake (Glacier National Park, MT) occupies a cirque
The sheer rock face at the back of the cirque is an arete - a narrow ridge between two cirques that have eroded back into the mountain from opposite sides
Portage Glacier (AK) - note lateral and medial moraines
Medial moraines form where glacial tributaries merge
End moraines form at the terminus of a glacier
Cirques with small residual glaciers in the Lyman Valley, WA
Note the end moraines, built of debris deposited by the glaciers when they extended a bit further downslope during the “Little Ice Age” (~1550-1850)