d. landslides have helped broaden the canyons since they were
first formed.
Fluvial erosion, as well as landslides, led to the broadening of
the canyons of Valles Marineris. It is the largest canyon in the
solar system with a depth of almost 2 km.
Which of the following statements about valles marineris, the great "grand canyon system" on mars is...