* Seafloor Spreading: This process involves the creation of new oceanic crust at mid-ocean ridges.

* Mantle Convection: The Earth's mantle is in constant motion due to heat from the core. Hotter, less dense mantle rock rises, while cooler, denser rock sinks.

* Decompression Melting: As solid mantle rock rises towards the surface at mid-ocean ridges, the pressure on it decreases. This pressure decrease allows the rock's melting point to drop. Since the rock is already hot, the decrease in pressure causes it to melt, creating magma.

* Magma Formation: This newly formed magma then rises to the surface, erupts, and cools to form new oceanic crust.

Therefore, the rising of solid mantle rock during seafloor spreading directly leads to magma production through decompression melting.