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* Geologists know that melting ice sheets sometimes form inland seas.
* Geologists also know that, sometimes these inland seas are held in by rock and earthen 'dams.'
* Should one of these 'dams' rupture, the entire volume of the inland sea will flow through the rupture, carrying everything in its path, downhill, all the way to the ocean.
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What you get in that case is the Eastern Washington scab lands. Not a Lichtenberg figure.
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* As quartz 'steam' adiabatically cools to 2,229-C upon rising, it returns to liquid lava droplets, and at approximately 1,650-C would solidify to a quartz particulate aerosol.
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This is not an adequate description of electrical discharge machining.