seafloor spreading
noun
a process in which new ocean floor is created as molten material from the earth's mantle rises in margins between plates or ridges and spreads out.
Words nearby seafloor spreading
British Dictionary definitions for sea-floor spreading
sea-floor spreading
/ (ˈsiːˌflɔː) /
noun
a series of processes in which new oceanic lithosphere is created at oceanic ridges, spreads away from the ridges, and returns to the earth's interior along subduction zones
Also called: ocean floor spreading
Scientific definitions for sea-floor spreading
sea-floor spreading
In the theory of plate tectonics, the process by which new oceanic crust is formed by the convective upwelling of magma at mid-ocean ridges, resulting in the continuous lateral displacement of existing oceanic crust. See more at magnetic reversal.