This image, sent by the Phoenix this Sunday, clearly shows layers of ice below Mars Lander itself. I get the impression, which recently heated up the ice, and water began to run down places under the surface of Mars.
That’s also happening on the earth when snow or ice melts and fades away. I think, are annual effects and not a single fact, for millions of years. There are annual seasons, as winter, and summer. The temperature difference is sufficient to interact in the ice sheets. That means erosion at the surface, releasing gases into the atmosphere and the existence of liquid water on the surface.
Not necessarily enough to run rivers but melting’s slowly drops by drops are transformed into gases, or small water puddles. Gravity always makes you look near the bottom, and so hydrogen circulates in three possible ways and this are Frozen, liquid and gas.
Source: Phoenix 234817main_phx20080601b-516
Wallpaper Ice under Phoenix 1024x768