Extend the theory and the spread of the ocean floor Sea Floor Spreading
Originally due in the creation of this theory to the mantle and the Mantle is a mid-ocean single place of origin is part of a new ocean floor is a place of high load currents to the top of carrier with new material from the mantle to the bottom of the ocean. And spread the bottom of the new environment prevalent the continents or continental masses are carried over the mantle moving by convection currents, and during the descent of oceanic crust to the mantle with convection currents fallen down when the trenches ocean where it is pasted part of the sediments of the ocean floor to the convection currents and thus the rate of movement and the spread of the ocean floor of About 1-2 cm per year, meaning that the entire ocean replaces each -300 million years and therefore that the oceanic crust of old continental crust is always present billions of years ago
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