1.

Classify rocks on the basis of silica contents

Answer»

In a widely accepted silica-content classification scheme, ROCKS with more than 65 PERCENT silica are CALLED felsic. those with between 55 and 65 percent silica are intermediate; those with between 45 and 55 percent silica are mafic.And those with LESS than 45 percent are ultramafic.



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