Question: What volcano, with a height of nearly 22 km, is the reason scientist believe that the location of the poles of Mars have shifted?
Sentence (from "Nili Patera dune field"): The research results from the evidence provided by the monitoring of the Nili Patera field, indicate sand fluxes of the order of several cubic metres per metre per year, similar to the flux observed at the sand dunes of Victoria Valley in Antarctica.
Relevant evidence: No