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Originally Posted by Philistine
There are rift valleys on other worlds (Valles Marineris on Mars for example) that could have been the start of plate tectonics if there had been enough heat to keep the process going. I don't think a giant impactor is needed.
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Hard to say. If Mars' crust had been thinner, or if it had deep oceans, then maybe it would have had plate tectonics even if they turned out to be short lived because of the loss of heat.