Poster presented at the XIV International Workshop on Modelling of Mantle and Lithosphere Dynamics, held at Olérons Island, France, August 31st to September 5th, 2015.<div><br></div><div>It introduces, for those in the community that didn't already know, some of the motivation for Underworld2 and some early concrete examples. In particular our de-facto Underworld 101 benchmark - the Rayleigh Taylor instabilities benchmark, and some detailed interplay with particles as shown in a hot plate example.</div
