Imagine you are studying the seafloor spreading along two different ocean ridges. Along the first ridge the magnetic stripes are uniformly narrow. Along the second ridge the magnetic stripes are wide near the crest, but they become narrower as you move away from the crest. What can you say about the history of motion in each example? 30 What drives plate tectonics? How does it work?

The earth tectonic history is created over these plate boundaries and these plates are a result of the formation of the earth crust which is recycled every year due to the mid-oceanic ridges that spread the lava on both sides of ridges

These lava adapt to the same geomaterial properties i.e there crystals capture the magnetic properties on the earth, so along the ridges the stipe of ridges are uniformly narrow, and thus as we move away from the magnetic stripes becomes older and aged in structure hence these are younger near the ridges due to the continuous upwelling of lava.

History of plate tectonic is can be seen through the thermodynamic decay which is a process of plates motion and evolution, where the crust is destroyed in trenches and is again formed from the mantel that is considered a molten rock.