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[Stockbild] Glacial moraines. Aerial photograph of the folds of a moraine on the Malaspina Glacier, Alaska, USA. Moraine is rubble material that has been transported and deposited by a glacial surge (downwards movement of glacial ice). Most glaciers are currently receding, but several, notably those in Alaska, show regular surges that produce moraine patterns. (KEYSTONE/SCIENCE PHOTO LIBRARY/BERNHARD EDMAIER) === ===