With the ominous-sounding “polar vortex” of cold weather that has been winding its way across much of the US, things are freezing up that normally don’t, creating phenomenon like walkable lakes and ice caves. In fact, a recent satellite photo from NASA of the Great Lakes region shows three of the five lakes almost completely frozen over — the first time this has happened in 20 years:
The last time the lakes reached around 90 percent ice coverage was in 1994.
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