0012000MinMedMax0012 00000000000 7%Primordial mantle-Wood et al. (1979a))Primordial mantle-McDonough et al. (1992)*Primordial mantle-Taylor & McLennan (1985)Condrite-Wood et al. (1979b)MORB-Bevins et al. (1984)+Upper cont. crust-Taylor & McLennan (1981)(Lower cont.crust-Weaver & Tarney (1984))Average cont crust-Weaver & Tarney (1984)7Average N-type MORB-Saunders & Tarney (1984);Sun (1980)Average OIB-Sun (1980) CUSTOM SPIDER