Valley networks are branching networks of valleys on Mars that superficially resemble terrestrial river drainage basins. They are found mainly incised into the terrain of the Martian southern highlands, and are typically - though not always - of Noachian age (approximately four billion years old).
Valley networks are branching networks of valleys on Mars that superficially resemble terrestrial river drainage basins. They are found mainly incised into the terrain of the Martian southern highlands, and are typically - though not always - of Noachian age (approximately four billion years old).
Source: Wikipedia "Valley network (Mars)" · CC BY-SA 4.0
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