spreading
131sea floor spreading — noun a geological process affecting mid ocean ridges by which molten lava is extruded and spreads to both sides of the ridge as it solidifies …
132seafloor spreading — ˈ ̷ ̷ ˌ ̷ ̷ noun : the divergence at midocean ridges of the tectonic plates underlying the oceans that is due to upwelling from the earth s interior of magma which forms new crust …
