Posted on 28 March 2021 by lets tokmakIn which zones do the p wave velocities appear to be steadily increasing 20-2900km , 2900-5100km, 5100-6400 , both a&b In which zones do the p wave velocities appear to be steadily increasing 20-2900km , 2900-5100km, 5100-6400 , both a&b