The boundary where new crust is formed is called a divergent plate boundary.

Here's why:

* Divergent means moving apart.

* Plate boundaries are the edges of the Earth's tectonic plates.

At divergent plate boundaries, the plates are pulling away from each other. This allows magma from the Earth's mantle to rise to the surface, cool, and solidify, creating new oceanic crust.

This process is responsible for the formation of mid-ocean ridges, rift valleys, and volcanoes.