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峡谷

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峡谷

峡谷是指由峭壁所围咾个山谷,一般由河流咾长辰光侵蚀而形成。美国亚利桑那州个科罗拉多大峡谷是最广为人知个大峡谷之一,渠个长度为446公里,平均深度达1200米。太阳系里最大个峡谷是垃拉火星赤道上个水手号峡谷。

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