We don't have lots of data about Mercury, but there is some. This turns out not to be true. There are some differences, however. Mercury has a planet-wide system of fault scarps and fault scarps. Faults are fractures in a rock along which movement has occurred.
Scarps are cliffs that form when rocks move along a fault.
Thrust faults happen when rocks are compressed, or squeezed. The resulting basin is half the size of Mercury, and is called the Caloris Basin . Mercury has polar ice caps, like Earth and Mars. However, it is unlikely that the core is liquid, because Mercury has a very weak magnetic field.