In my experience, YECs accept plate tectonism only so far as it suits their preconvictions. For example, they accept the existence of Pangaea because they can make it jive with Genesis' reference to the "days of Peleg", but they reject the evidence for the existence of other supercontinents such as Rodinia or Columbia. They also reject the Wilson cycle and the mechanisms that are known to drive plate tectonics. So sure, they accept that the lithosphere is divided up into movable plates, but they pretty much summarily reject the science of plate tectonics.
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