Geomorphologic evidence for liquid water

Besides Earth, Mars is the only planet with a record of resurfacing process es and environmental circumstances that indicate the past operation of a hy drologic cycle. However the present-day conditions on Mars are far apart of supporting liquid water on the surface. Although the large-scale morpholog y of the Martian channels and valleys show remarkable similarities with flu id-eroded features on Earth, there are major differences in their size, sma ll-scale morphology, inner channel structure and source regions indicating that the erosion on Mars has its own characteristic genesis and evolution. The different landforms related to fluvial, glacial and periglacial activit ies, their relations with volcanism, and the chronology of water-related pr ocesses, are presented.