Final answer:
The statement is true: mid-ocean ridges such as the Mid-Atlantic Ridge mark oceanic divergent plate boundaries where seafloor spreading occurs and new oceanic lithosphere is formed.
Step-by-step explanation:
The statement that oceanic divergent plate boundaries are marked by mid-ocean ridges, such as the Mid-Atlantic Ridge, is True. At these boundaries, seafloor spreading occurs as tectonic plates separate and new oceanic lithosphere is formed along the spreading center.
Plates pull apart from each other along rift zones, with molten rock, specifically basaltic lava that forms the ocean basins, rising from below to fill the space between diverging plates. This process of divergent plate boundary creation is exemplified by the Mid-Atlantic Ridge, which is indeed an underwater mountain system formed by the separation of tectonic plates.
Essentially, the Mid-Atlantic Ridge is a clear example of an oceanic divergent plate boundary where new lithosphere is constantly being created by upwelling magma that solidifies as it cools and adds to the separating plates on either side of the ridge.