Caption: 
Formation of an impact-induced Earth's mantle heterogeneity. The figure shows the location of the projectile's core (dark brown) and mantle (green) particles. Earth's particles  are not shown for clarity, and the red and grey half-spheres indicate the Earth's  core and surface, respectively. The yellow cone defines a region, or domain, of high  concentration of projectile's core material. The inset shows an image of a komatiite, 	 a mantle-derived volcanic rock, with the characteristic olivine spinifex  pattern due fast cooling at the surface. These kind or rocks could probe projectile  enriched mantle domains that formed early in Earth's history.

Credit: 
Image Courtesy of Department of Earth & Atmospheric Sciences, University of Alberta