This is an image of a Martian river valley.
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Image from: NASA

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Martian River Valleys

These river valleys do not resemble river valleys on Earth. They are very short, about as long as a football field. Because they are so short, it would seem that the running water ran out very quickly.

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Martian Floods

Separate from the Martian outflow channels, or the river valleys, are large Martian lakes (600 km, or ~1000 miles across) which once were part of a flood. ...more

Martian Volcanoes

On this map of Mars, the lightly cratered Tharsis Ridge is shown, as well as the heavily cratered Martian highlands (near the bottom of the picture), and Valles Marineris to the right. The volcanoes are...more

The Transfer of Water in Martian History

On Mars, the water is trapped, frozen, within the ground. Nevertheless, there is evidence for running water on Mars. When the water is melted and released to the surface, it will run from higher ground...more

The Martian Cryosphere

The drawing shows the depth at which water may be frozen into the ground. To have water running on the surface of Mars, this water region must be near to the surface. This may have happened at various...more

Martian Fog

This picture shows fog on Mars. More fog has been seen in images returned by Mars Global Surveyor of the south polar region of Mars. Martian fog may have a little bit of acid mixed in with the water drops....more

Martian Orbital Eccentricity

The orbit of Mars is very oval shaped. The orbit is much more oval shaped than the Earth's orbit. This means that the climate of Mars can change drastically between warm and cold. ...more

Martian Storm

This is an image of a storm moving across the Martian land. The camera is looking down on the storm, the same way storms are presented on the news. The storm provides evidence that there is water on Mars....more

Mars' Thin Atmosphere

This is image of a Martian sunset illustrates just how thin the Martian atmosphere is. In this image, the Martian sky appears pink and a little bit dark at sunset. Unlike the Martian sky, the Earth's sky...more

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