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  • the earth and its atmosphere
    • what are the layers of the earth
      • inner core, outer core, mantle, crust in that order
    • what is the atmosphere made of
      • 78 nitrogen       21 oxygen      0.04 carbon dioxide
    • what the earths crust made of
      • oxygen 26.4 silicon 28.2    aluminium 8.3  iron 5.6


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