Definitions for "Sea-floor spreading"
Keywords:  ridge, upwelling, mid, crust, rift
the process by which new sea floor is created, pushing two tectonic plates further apart, usually associated with a mid-ocean ridge and/or rift valley.
The formation and growth of oceans that occurs following rifting and is characterized by eruptions along mid-ocean ridges, forming new oceanic lithosphere, and expanding ocean basins. See also divergence.
The concept that new oceanic crust is created at the mid-ocean ridge as a result of divergence between plates.
Keywords:  polarity, reversals, magnetic, see
See magnetic polarity reversals.