An undersea volcanic formation that does not rise at least 1000 meters above surrounding sea floor is called a seamount.
Step-by-step explanation:
Seamount is an undersea mountain made by volcanic activity. Most seamounts are volcanic in creation, and thus manage to be found on marine crust near mid-ocean ridges, mantle plumes, and island arcs. Overall, seamount and guyot coverage is excellent as a balance of seafloor area in the North Pacific Ocean, equal to 4.39% of that ocean region.