Final answer:
A divergent boundary is represented by a mid-ocean ridge, where tectonic plates move apart and new oceanic crust is formed by rising basaltic lava from the mantle.
Step-by-step explanation:
A divergent boundary is usually represented by a mid-ocean ridge. Mid-ocean ridges are underwater mountain ranges formed by the movement of tectonic plates. These structures are created as oceanic plates move away from each other at divergent boundaries. The space created by this separation is filled with basaltic lava that rises from the mantle. Over time, this process leads to the formation of new oceanic crust and the expansion of the ocean floor, a phenomenon exemplified by the Mid-Atlantic Ridge.
As plates diverge at a mid-ocean ridge, the asthenosphere from below the lithosphere rises, partially melts due to decreased pressure, and creates new oceanic crust through volcanic activity. The continuous activity at divergent boundaries means that mid-ocean ridges are often associated with frequent earthquake and volcanic activity.