The inner core of the earth is mainly composed of iron with nickel and some traces of other lighter elements may also present. The lower mantle consists of metals silicon and magnesium and oxygen with some iron, calcium and aluminium. The upper mantle has olivene and pyroxene (iron/magnesium silicates) with some calcium and aluminium. The crust is primarily composed of quartz (silicon-di-oxide) and other silicates like feldspar.
The total chemical composition of Earth by mass is
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