The 2021 IEEE SciVis Contest is dedicated to creating novel approaches and state-of-the-art visualizations to assist domain scientists to better understand the convection processes in the Earth’s mantle. Contest participants will be invited to present at the special SciVis Contest session at IEEE Vis 2021 on October 23 - 28, 2021 1, and the winning team will be invited to submit a full journal article (with an expedited review process) to IEEE Computer Graphics and Applications (CG&A) Journal. The contest is sponsored by IEEE Vis and Compute Canada.