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ablation active layer algae alluvial ancyclonema nordenskioidii aufeis boulder gravel calving circle, nonsorted circle, sorted cirque glacier conduit crevasse diamicton diapir drumlin dry calving equilibrium line esker frost crack frost table glacio-isostatically ice lenses ice wedge lateral moraines lichen medial moraine meltwater channel moraine mudboil outwash palsa permafrost permafrost table pingo rib-and-trough rock burst shear fractures solifluction superimposed ice/sediments thrusting tree line tundra tundra fire

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