These objects undergo cyclic surges that could be explained by the deformable bed hypothesis.
These objects undergo cyclic surges that could be explained by the deformable bed hypothesis. Plastic flow and basal sliding can cause these objects to move, and they have cavities known as moulins [moo-LANS]. Firn can be found on these objects, and a bergschrund [BERK-shroont] is a deep crack at their upper end. These objects form hills known as drumlins, and they deposit till that forms moraines. In the process of calving, an iceberg breaks off from one of these objects.  For 10 points, name these very slow moving masses of ice formed from accumulated snow
These objects undergo cyclic surges that could be explained by the deformable bed hypothesis.
GLACIERS