(a.) View of the mantle below the Pacific, warm colors denote slower than average seismic wavespeeds. Cold colors denote faster than average seismic wavespeeds associated with subduction zones. (b.) With three-dimensional tomography, scientists can isolate vertical as well as horizontal slices of the mantle. (Image courtesy of Ebru Bozdag, University of Nice and David Pugmire, Oak Ridge National Laboratory.)
Credit: Hom N. Gharti
Credit: James Smith
