Assertion: glacier's flow | /r/HasProperty | separated by quiescent periods of slow flow
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Source sentences:
text: We have cold-based glaciers, which have little flow velocity; polythermal glaciers, which are partly frozen to their bed; wet-based glaciers which have sheet flow (as is described in the above sections); ice streams, which have very rapid flow velocities; and surging glaciers, which have periods of rapid flow separated by quiescent periods of slow flow.