Final answer:
The Nazca Plate forms a boundary with the African Plate.
Step-by-step explanation:
The plate that forms a boundary with the African Plate is the Nazca Plate. The African Plate is bounded by the Nazca Plate along the western coast of Africa. This boundary is known as the African-Nazca Plate boundary, and it is marked by the presence of the Mid-Atlantic Ridge and the South Atlantic Ocean.
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