According to researchers, these water resources might be useful for future manned missions to the Red Planet.
NASA has shown a picture of seasonal water flows on a steep slope in Coprates Chasma, the part of the grandest canyon system on Mars, Valles Marineris.
It is reported on NASA web site, that the image was taken on July 21, 2015 with camera HiRISE (High Resolution Imaging Science Experiment) of the orbiter MRO (Mars Reconnaissance Orbiter).
In the picture we can see an area of ground 536 meters wide, where we can notice the linear structures, which regularly appear in warm seasons and disappear during cold seasons within a year. Scientists believe that they may be formed by groundwater sources.
Water on Mars is in the frozen state, mostly at its poles. More water was found in subsurface soil layers. Scientists believe that in the equatorial areas on the planet, a significant amount of water may be discovered in the canyons of Valles Marineris.
According to researchers, these water resources might be useful for future manned missions to the Red Planet. However, scientists do not yet know the exact chemical composition of the liquid flowing in the canyons periodically. Besides, some researchers believe that the linear structures in Valles Marineris can be formed by sand instead of water.