How Did the South American Plate and African Plate move
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Both South American Plate and African Plate move away from divergent boundaries.

Explanation:

The divergent boundary between the South American plates and an ocean basin move apart from each other and spread. Likewise the divergent boundary between the African plates and ocean basin also move apart from each other and spread. At the divergent boundaries, rock rises above the mantle and hardens. This added new solid rocks to the edges of both plates

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