There is no evidence of plate movement as on the Earth The vast canyons on the eastern flanks of the Tharsis bulge are the most spectacular result of crustal deformation.
(The vast canyons on the eastern flanks of the Tharsis bulge; are; the most spectacular result of crustal deformation)
The vast canyons on the eastern flanks of the Tharsis bulge
are
the most spectacular result of crustal deformation