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地质之谜：地球缺失长达10亿年的岩石层 | 科罗拉多 | 大峡谷 | 地层

地质之谜：地球缺失长达10亿年的岩石层 | 科罗拉多 | 大峡谷 | 地层
epochtimes.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from epochtimes.com Daily Mail and Mail on Sunday newspapers.

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地球探秘：找寻地球失去的10亿年历史 - BBC News 中文

地球探秘：找寻地球失去的10亿年历史 - BBC News 中文
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金秋旅游：8个绝美旅游目的地，教你尽情享受秋日胜景

金秋旅游：8个绝美旅游目的地，教你尽情享受秋日胜景
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美国大峡谷著名未解之谜新研究提出一猜想 | 热年代学 | Grand Canyon

美国大峡谷（Grand Canyon）是被列为世界遗产的知名自然景观，记录着地球近20亿年来地质变迁的历史。可是其中一个著名的不解之谜是，有一段长达10亿年的时期在这些层积岩内完全找不到踪迹。

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景区玻璃栈道建设处于三无状态？标准实施后不再是了_管理

景区玻璃栈道建设处于三无状态？标准实施后不再是了_管理
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