<P> The continental crust has an average composition similar to that of andesite . The most abundant minerals in Earth 's continental crust are feldspars , which make up about 41 % of the crust by weight , followed by quartz at 12 % , and pyroxenes at 11 % . Continental crust is enriched in incompatible elements compared to the basaltic ocean crust and much enriched compared to the underlying mantle . Although the continental crust comprises only about 0.6 weight percent of the silicate on Earth , it contains 20 % to 70 % of the incompatible elements . </P>
whats the composition of the earth 's crust
an average composition similar to that of andesite