The plate boundary where two plates separate is callled a .........    plate boundary

The plate boundary where two tectonic plates separate is called a divergent plate boundary. At this type of boundary, tectonic plates move away from each other, leading to the formation of new crust as magma rises from below the Earth’s surface. This process usually occurs at mid-ocean ridges, where the separation of plates creates underwater mountain ranges and volcanic activity.

As the plates diverge, the magma that wells up to fill the gap cools and solidifies, forming new oceanic lithosphere. This can also cause earthquakes, as the movement of tectonic plates can create tension and friction along faults. Overall, divergent boundaries play a vital role in the ongoing process of plate tectonics, helping to shape the Earth's surface over geological time.