What Is Seafloor Spreading Theory
Seafloor spreading theory that oceanic crust forms along submarine mountain zones known collectively as the mid ocean ridge system and spreads out laterally away from them.
What is seafloor spreading theory. Seafloor spreading is a geologic process where there is a gradual addition of new oceanic crust in the ocean floor through a volcanic activity while moving the older rocks away from the mid oceanic ridge. Seafloor spreading leads to the renewal of the ocean floor in every 200 million years a period of time for building a mid ocean ridge moving away across the ocean and subduction into a trench. This idea played a pivotal role in the development of plate tectonics a theory that revolutionized geologic thought during the last quarter of the 20th century. Seafloor spreading helps explain continental drift in the theory of plate tectonics.
When oceanic plates diverge tensional stress causes fractures to occur in the lithosphere. The mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate. In 1912 when alfred wegener proposed that the continents had once been joined together and had split apart the biggest weakness in his hypothesis was the.
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