In the 1960s, ____ ____, an American geologist, together with Robert Dietz introduced the concept of ____ spreading. The seafloor above is then pulled apart, created acrack in the crust where ____ flows out, and becomes the ____ ____ When the new seafloor pushes the ____ seafloor far from the ____ ridge, this allows the creation of a ____ ____ As the new seafloor is formed at the mid-ocean ridge, the ____ ____ farthest from the ridge is destroyed at the ____ ____ One of the geological features formed is an ____ ____ and the reason why there are ____ in the ____ areas

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