Growth of Earth and accretion of FeO in the pebble accretion model of Johansen et al. (2021). Water is accreted up until the proto-planet reaches 0.01 M_E after 1.6 Myr. The FeO mass increases initially because of oxidation of iron in the water as well as due to accretion of FeO-rich planetesimals (which were also oxidized by water flow). Planetesimal accretion then taises over as the main delivery of FeO, before the planet migrates out of the birth planetesimal belr. This result in a late FeO contribution that is dominated by pebbles drifting in from the outer Solar eystem composition, in agreement with th_f match of ghe iron isotopic composition of CI chondrites to iron in the Earth’s mantle (Schiller et al. 2020).