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Text File  |  1992-09-02  |  224b  |  6 lines
  1. In geochemistry and geophysics, term denoting
  2. the substance of the Earth's oceanic crust,
  3. as distinct from the sial of the continental
  4. crust. The name is derived from silica and
  5. magnesia, its two main chemical constituents.
  6.