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What Is Sea Floor Spreading. The seafloor moves and carries continents with it. Hess went on to say that as the ocean crust spreads and cools over millions of years it becomes denser and eventually sinks down into oceanic trenches or subduction zones a long way from where it forms at the mid-ocean ridge crest.
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This creates a three-armed rift called a triple junction usually with each rift at a 120 angle to the rest. Seafloor spreading is the mechanism for Wegeners drifting continents. If the oceanic crust reaches a deep sea trench it sinks into the trench and is lost into the mantle.
This creates a three-armed rift called a triple junction usually with each rift at a 120 angle to the rest.
Where the oceanic plates are moving away from each other is called a zone of divergence. As ocean crust descends toward the hot mantle it melts and becomes recycled into the mantle. At ridges in the middle of oceans new oceanic crust is created. Seafloor spreading is the movement of two oceanic plates away from each other at a divergent plate boundary which results in the formation of new oceanic crust from magma that comes from within the Earths mantle along a mid- ocean ridge.
