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speed of several millimetres to centimetres per year (plate tectonics). So-called mid-oceanic ridges run through the oceans. In these zones magma rises from the Earth’s interior to the surface, cools down there [...] magma again. A region in which new seafloor continuously forms is, for instance, Gakkel Ridge in the Arctic. This is a submarine mountain range whose northern foothills extend from the northeast tip of Greenland

forward to continuing the one-year-long MOSAiC expedition and its research on the ocean, ice and atmosphere in the Arctic. Earlier this week, their predecessors from Leg 3 returned to Bremerhaven on board

Arctic Sea ice: Microstructure and geophysical processes Dr Hajo Eicken, Scientific Director of the Alfred Wegener Institute. Sea ice snow Arctic glaciology Sea-ice geophysics is a central research field [...] changes and ocean currents. Although these processes occur on very small spatial scales, they strongly affect the growth, stability, and decay of sea ice and thereby influence both Arctic ecosystems and [...] field within polar and climate sciences. Sea ice covers large parts of the Arctic and Antarctic and plays a key role in the Earth system by linking physical, ecological, and climatic processes. A particular