As I look down into a Petri dish of sand through a binocular microscope, the larger grains become obelisks, with smaller ones forming avenues between them. It’s a microscopic echo of the Chicago ...
Scanning electron microscopy reveals the shape and texture of a quartz sand grain from the Mississippi River. The pictured sand grain is about 200 micrometers in length. (Image credit: Michael Hasson) ...
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