similarity between continent and ocean
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Oceans and continents are part of the same thermal system. Both have an upper rigid mechanical layer where heat loss is by conduction and a lower thermal boundary layer where convection is dominant. The simple conductive definition of the plate thickness is an oversimplification.
Oceanic crust is made of basalt, dark in color, thin compared to continental crust (5 km thick vs 20-50 km), denser than continental crust, and geologically young. Continental crust is composed of granite, light in color, and thicker, less dense, and older than oceanic crust.
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