Glaciers. Aerial view of the vast Malaspina glacier plain in Alaska, USA. Earth. At top centre, Mount St. Elias can be seen in the neighbouring country, Canada. Mount St. Elias is 5,489 metres high, making it the second highest mountain in Canada. The dark material covering much of the glaciers' surfaces is rubble picked up by the glaciers during their journeys. It is generally comprised of soil and rock. When the glaciers melt, such material is deposited to form moraines.
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