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2013-07-14T01:03:11+02:00
OCEANIC BARK IS MUCH MORE DENSE WHY IS MADE BY IRON MAFIC MINERALS SUCH, MG, SO HAVE BASALTIC NATURE.
THE CONTINENTAL IS LESS DENSE AND SO IN THE TECTONICS WITH NEVER subducted oceanic crust, MOUNTAIN CHAINS FORM BUT THE NATURE OF THE CONTINENTAL CRUST OF TYPE ALKALINE leucocratic OR MADE PRIMARILY OF SILICA, ALUMINUM IN MINERAL CLEAR END