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On Mars! There is no running water to wear away the rocky landscape on Mars, so huge valleys can survive for millions of years. A system of enormous canyons called the Valleys Mariners (Mariner Valleys) was discovered by the space probe Mariner 9.

It is more than 4,000 km long and four times as deep as the Grand Canyon in the USA. Scientists think that these valleys were caused by erosion (wearing-away).

During storms the gritty Martian dust is blasted by winds reaching up to 450 km/h, we read more...

Tags: mars, canyon

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