One of the seasonal changes on Mars is a regular change pattern of the landscape. Each Martian spring formed during the winter the mountains begin to move gradually and disappear completely.
To such conclusion experts of NASA, who studied the surface of Mars for two seasons with the orbiter Mars Reconnaissance Orbiter (MRO). Every year during the cold winter on Mars the CO2 concentration in the condensed form of dry ice, which is deposited on the Martian poles. But the thaw, the upcoming spring and summer, these glaciers forced to dissolve. Along with these changes and topography of the planet.
In addition, scientists have found evidence that the wind at the north pole of Mars are strong enough to move large amounts of red sand, is the foundation of the Martian soil. This is another factor contributing to the permanent modification of the "face of Mars."