Final answer:
Regions of upper-level divergence tend to occur in divergent plate boundaries, specifically along rift zones. Molten rock rises from below to fill in the space between the receding plates, leading to the formation of mid-ocean ridges. These ridges are usually offset by numerous transform faults along their length.
Step-by-step explanation:
Regions of upper-level divergence tend to occur in divergent plate boundaries. These boundaries occur when tectonic plates pull apart from each other along rift zones, such as the Mid-Atlantic ridge.
Molten rock rises from below to fill in the space between the receding plates, forming basaltic lava and creating most of the ocean basins. This process leads to the formation of mid-ocean ridges, which are usually offset by numerous transform faults along their length.