10 April 2015

Sea floor spreading is the process by which new oceanic crust is formed by the upwelling of magma through diverging tectonic plates. 
Read more at http://www.geologyin.com/2015/04/sea-floor-spreading-and-polar-reversal.html#V2ky4pv55bracUGw.99

 

 

 

 

 

 

 

 

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