Something when we get ahead of hypertensions is called cardiac arrest.
It will form a new land mass or a younger seafloor(which is explained in seafloor spreading theory and continental drift theory).
In plate tectonics theory, a divergent boundary exists between two tectonic plates that seperates from each other. There are two classifications of divergence; Continental to Continental, and Oceanic to Oceanic. In divergence between two continents they produce rifts, that become rift valleys. Geologic features of divergence between two oceanic plates exist as mid-oceanic ridges.