Here's why:

* Mid-ocean ridges are underwater mountain ranges where new oceanic crust is formed. This formation happens due to the separation of two tectonic plates.

* Divergent plate boundaries are areas where tectonic plates move apart from each other. As the plates pull away, magma rises from the mantle and erupts, creating new oceanic crust.

* The newly formed crust cools and solidifies, adding to the existing crust on either side of the ridge, pushing the plates further apart.

So, the process of seafloor spreading at a mid-ocean ridge is a direct result of the interaction of divergent plate boundaries.