![]() Some minor eruptions might still occur on the planet today. Mars also has many other kinds of volcanic landforms, from small, steep-sided cones to enormous plains coated in hardened lava. ![]() Olympus Mons is a shield volcano, with slopes that rise gradually like those of Hawaiian volcanoes, and was created by eruptions of lava that flowed for long distances before solidifying. The massive volcano, which is about 370 miles (600 km) in diameter, is wide enough to cover the state of New Mexico. Mars also has the largest volcanoes in the solar system, Olympus Mons being one of them. Large channels emerging from the ends of some canyons and layered sediments within suggest that the canyons might once have been filled with liquid water. ![]() 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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