Moraines clearly seen on a side glacier of the Gorner Glacier, Zermatt
. The lateral moraine
is the high snow-free bank of debris in the top left hand quarter of the picture. The medial moraine
is the double line of debris running down the centre-line of the glacier.
Moraines are accumulations of debris that are found in regions where there are glaciers or were glaciers formerly.
Moraines which are found far off from existing glaciers were created during a past ice age. The debris may have been taken off the valley floor as a glacier moved or fallen off the valley walls as a result of weathering. Moraines may be made of silt like glacial flour to large boulders. Moraines may be on the glacier’s surface or deposited as piles or sheets of debris where the glacier has melted. Moraines may also develop when glacier or iceberg transported rocks fall into the sea as the ice melts.
Images for kids
The red line in the North Sea marks the Dogger Bank, which is most likely a moraine formed in the Pleistocene
Moraine in Rocky Mountain National Park, taken by Ansel Adams in 1941
Lateral moraines of a retreating glacier in Engadin
Lateral moraines above Lake Louise, Alberta, Canada.
Ground moraines create irregular, rolling topography
Medial moraines, Nuussuaq Peninsula, Greenland
Multiple erratics on the terminal moraine of the Okanogan Lobe. Cascade mountains in the background.