Sea Floor Spreading Diagram: This illustration demonstrates the process of seafloor spreading, highlighting the formation of new oceanic crust at mid-ocean ridges and the movement of tectonic plates away from the ridge, with a focus on the age and thickness of marine sediment.

Diagram illustrating sea floor spreading, showing the early and later stages of an ocean basin widening after the initial rifting of a continental plate, with labels for mid-oceanic ridge, spreading center, continent, lithosphere, and upwelling magma from the mantle.