Life on top feature 610/13/2023 ![]() ![]() ![]() The canyons merge in the central part of the Valles Marineris in a region as much as 370 miles (600 km) wide. Individual canyons within the system are as much as 60 miles (100 km) wide. Scientists think the Valles Marineris formed mostly by rifting of the crust as it got stretched.
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