Steve Mould | Tektites - why some rocks are dumbbell shaped @SteveMould | Uploaded 4 years ago | Updated 4 hours ago
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Tektites form in mid air after a meteorite strike. They're made of glass and the ones that cool down while spinning form dumbbell shapes.

Image credit:
commons.wikimedia.org/wiki/File:Two_tektites.JPG - Brocken Inaglory

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