what do you call the location where new oceanic plates are create?

The location where new oceanic plates are created is called a mid-ocean ridge. These ridges are found at divergent plate boundaries where tectonic plates are moving apart and magma rises up from the mantle to form new oceanic crust. This process is also known as seafloor spreading. The mid-ocean ridge system extends for tens of thousands of kilometers around the Earth, making it the primary site for the creation of new oceanic lithosphere.