Now that the weather has turned warmer, I was not expecting to write about ice – especially after so many months with the opportunity right outside my window every single day. But this video from the Jet Propulsion Laboratory amazed me. The scientists there have figured out what might cause unusual markings they’ve seen on the surface of Mars. Downhill tracks that have a distinctive profile – a certain shape that helps explain how they were formed.
Under the right temperature conditions, dry ice can glide down a slope on a cushion of gas.
I love it that researchers were able to duplicate the effect here on Earth. Sliding blocks of dry ice down sand dunes is a form of light entertainment I hope to try someday – a kind of stranded-in-the-desert shuffleboard, I guess.
The notion of ice in motion reminded me of this incident from a couple of months ago, when the slowly melting lake ice in Lake Mille Lacs was pushed by a spring wind to create a real-life version of the voracious ice monster in a child’s nightmares. It comes across as the evil spawn of a slithering blob and a slow-motion avalanche.
Fun, at first. But horrifyingly relentless as it creeps, creepily.
I realize that we do not have to worry much about hurricanes, tsunamis and earthquakes in the Upper Midwest, but it feels like the ice is all around us, and on the advance.
What natural phenomenon strikes you as unnatural?







