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| Valles Marineris: The Grand Canyon of Mars |
The largest canyon in the solar system creates a wide crevice across Mars. The valley, Valles Marineris, extends over 3,000 km long, 600 km across, and 8 km deep. The origin of the valley is unknown, but a popular hypothesis claims that it started as a crack from billions of years ago as the planet cooled. Many geologic processes have been identified in the canyon.
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