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The composition of the Earth's crust is relatively restricted from both a chemical
and mineralogical viewpoint. Approximately 75 percent of the crust consists of
oxides of silicon and aluminum (Table 1); the bulk of the rock- forming minerals
The volume of the continental crust is equal to 6,500,- 000,000 cubic kilometres (
1,500,000,000 cubic miles), and that of the transitional zones (continental
margins) is 1,540,000,000 cubic kilometres (370,000,000 cubic miles).
Considering the ...
the crust may have been more basic (basaltic) in composition. The crust later
became divided: (1) into areas in which regional metamorphism, granitization,
and rock deformation occurred, and (2) into areas in which such phenomena
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review