All these answers and none correct. The correct answer is we have no freaking clue. The pressure theory is basically debunked by the fact that the pressures needed to do this are insane. The friction melting theory is probably correct but we don’t know. Basically because ice is rough as is everything, friction heats up and creates a thin, molecular scale, line of water between the ice and object on it. Alternatively this doesn’t happen and maybe ice just always has that because of various cohesive forces. The long story short is we don’t know.
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