It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins.
看来，板块上侧冷却的地幔物质的下沉流可能是造成这种深盆地的原因。
2
"There could have been a massive change in the distribution of mantle," Perron said, "which would have caused the planet to shift into its current position."
佩伦说：“地表覆盖物可能经历过大规模的变化，致使火星变成了目前的地形。”
3
The current inference of mantle flow is largely based on seismic tomography and anisotropic analysis.