Deep Earth Simulation (video) Arizona State University Loading video... Caption This video shows a numerical simulation of Earth's deep mantle. The top panel is temperature and the bottom panel is composition which includes three components: the more-primitive reservoir at the lowermost mantle (cyan), the subducted oceanic crust (yellow) and the depleted background mantle (black). Notice that as the oceanic crust is subducted to the lowermost mantle, some part of it is directly carried up to the surface by plumes which a large fraction of it episodically enters the more-primitive reservoir. As a result, plumes forming on top of the more-primitive reservoir could simultaneously entrain a combination of compositional components to the surface, including (a) relatively young oceanic crust, (b) ancient more-primitive material stirred with older oceanic crust, and (c) background, depleted mantle. Credit Mingming Li and Allen McNamara Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.