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From SPACE.com:
Mercury's surface is not only peppered with impact craters, but also wrinkled with mysterious chains of cliffs.
Scientists think the "lobate scarp" cliffs — some 2 miles (3.2 kilometers) high and hundreds of miles long — were created as Mercury's crust bunched up around its shrinking interior, something like a dried-out piece of fruit. A new theory, however, suggests that rising sheets of hot mantle rock popped out the planet's characteristic ridges, helping to create the cliffs.
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Re: New Theory Explains Mercury's Mysterious Cliffs
