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Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection
Answer: The seafloor moves apart or “spreads” and carries continents with it.

Explained:
Seafloor spreading happens at the bottom of the ocean at a mid-oceanic ridge as tectonic plates move apart.