The Archean Earth was hotter (from impacts and more radioactive decay). A more vigorous mantle convection probably kept most plates smaller than today.
https://www.powershow.com/view4/718689-ZGM1Z/The_Archean_Earth_was_hotter_from_impacts_and_more_radioactive_decay_A_more_vigorous_mantle_convection_probably_kept_most_plates_smaller_than_today_powerpoint_ppt_presentation
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