The professor explains thaw lake formation as a cycle of events that occur repeatedly. Summarize this cycle, starting with the eventflled in below. A. Meltwater flows into cracks in permafrost.. B. Ice wedges inside permafrost completely melt.. C. Freezing water expands cracks in permafrost.. D. Ice in the active layer melts as temperatures rise.. E. Permafrost shrinks and cracks as temperatures drop..