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Glaciers move slowly, but Bear Glacier seems to have racing stripes. Glaciers pick up dirt and debris from the rocks they pass. They deposit that material in accumulations called moraines. A lateral moraine is the material on the sides of a glacier.

Two glaciers flowing together form a medial moraine in the middle where they join and show up as those dark stripes. When a glacier has a medial moraine, it’s made up of more than one ice flow.

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Aug. 10, 1976, Landsat 2 (path/row 74/18) — Bear Glacier, Alaska, USA
June 18, 1984, Landsat 5 (path/row 69/18) — Bear Glacier, Alaska, USA
Sep. 27, 1994, Landsat 5 (path/row 68/18) — Bear Glacier, Alaska, USA
July 1, 2000, Landsat 7 (path/row 68/18) — Bear Glacier, Alaska, USA
Aug. 5, 2001, Landsat 7 (path/row 68/18) — Bear Glacier, Alaska, USA
June 21, 2005, Landsat 5 (path/row 68/18) — Bear Glacier, Alaska, USA
July 21, 2007, Landsat 7 (path/row 68/18) — Bear Glacier, Alaska, USA
Sep. 15, 2010, Landsat 7 (path/row 68/18) — Bear Glacier, Alaska, USA
Sep. 2, 2014, Landsat 8 (path/row 68/18) — Bear Glacier, Alaska, USA
Sep. 4, 2018, Landsat 8 (path/row 69/18) — Bear Glacier, Alaska, USA
Sept. 9, 2020, Landsat 8 (path/row 69/18) — Bear Glacier, Alaska, USA

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