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Transcript
The plates are pulled and pushed, created and recycled, by convection currents within a solid but hot, plastic mantle. Left: Oceanic crust is formed where hot rising magma pushes plates apart. 100 km Below: Plates are destroyed through subduction back into the deep Earth (taking craters with them) This recycling is not uniform for continents and oceans. On average, oceanic crust is much younger than continental crust. On this colour-coded map, ages go from recent (red) to 180 m.yrs old (blue)... Where is old oceanic crust?
