Divergent plate boundaries are situated along the crests of mid-ocean ridges.

Here's why:

* Mid-ocean ridges are underwater mountain ranges that form at divergent boundaries.

* Divergent boundaries are where tectonic plates move apart, creating space for new oceanic crust to form.

* Magma rises from the mantle at these boundaries, cools, and solidifies, creating new oceanic crust. This process is called seafloor spreading.

So, the mid-ocean ridge is the location where new crust is being formed and where the plates are actively moving apart.