This is an image of the surface of Mars.
Click on image for full size
The uniquely red global surface of Mars is marked by many interesting
features - some like those on the Earth and others
strangely different. The reddish color is caused by rust
(iron oxide) in the soil.
Some of these features are; volcanoes, canyon systems, river beds, cratered
terrain, and dune fields.
Of these features, the most interesting includes the
apparently dead volcano Olympus Mons, which rises 23 km (~75,000 ft)
above the surrounding plains and is the highest known peak in the
Solar System. Valles Marineris is a giant canyon system that runs
about 2,500 miles across the surface of the planet and reaches depths
of 6 km or 4 miles (for comparison, the Grand Canyon is not more
than 1 mile deep).
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