Interesting. The two likely seeming answers are lightning and water freezing. Song of ice and fire.
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Lightning?
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Lightning
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dropping something heavy
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Water dripping onto the sidewalk? The drip hits the center and over time the puddle spreads in that pattern?
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The upside down
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Superman landing?
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Reminds me of the marks lightning strikes leave but I doubt that's the answerpic.twitter.com/DN2r94wUgV
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Lightning strike would melt the silica into glass. Have seen it first-hand after the fact. Get a big blob of glass where the strike happens.
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Water gets in a small hole, freezes, expands, then breaks new ground
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