According to the Wilson Cycle, continents first break up by forming internal subduction zones that rift them apart and immediately reduce the size of their margins by subducting so much sediment.

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The Wilson Cycle describes the breakup of continents initially through rifting caused by mantle plumes or other upwellings that thin the crust, leading to the formation of a new ocean basin, not through internal subduction zones. Subduction zones typically form at the edges of continents as oceanic plates are forced under continental plates, rather than causing the initial breakup.

According to the Wilson Cycle, Continents First Break Up by Forming