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Canyons Show Time in Rock Layers
峡谷在岩层中展现时间
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Canyons are deep valleys cut by rivers through rock.峡谷是河流在岩石中切割形成的深谷。
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Each rock layer tells a story about Earth’s past environment.每一层岩石都讲述着地球过去环境的故事。
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Red rocks may mean dry ancient deserts once covered the area.红色岩石可能意味着远古干旱沙漠曾覆盖此地。
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Gray layers can show old ocean floors now lifted high.灰色岩层可能显示古老的海底如今已被抬升至高处。
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Rivers keep cutting deeper, exposing older and older rocks.河流持续下切，不断暴露更古老的地层。
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Scientists read these layers like pages in a history book.科学家像阅读历史书的页码一样解读这些岩层。
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Canyons exist on every continent except Antarctica.除南极洲外，各大洲都有峡谷。
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They prove that landforms change slowly but constantly over time.它们证明地貌虽缓慢但始终在不断变化。