Late stage of accumulation and chemical composition of the terrestrial planets

The model in which the differences of chemical composition of the terrestrial planets are determined by special conditions at the later stage accumulation is discussed. Impact heating would rapidly lead to differentiation of Mercury's interiors. Subsequent high-velocity collisions of Mercury with planetesimals of a comparable size would erode away much of the silicate crust and mantle; such silicates would be accumulated by Venus and fall into the Sun. This model is in agreement with the current models of the terrestrial planets internal constitution.