Final answer:
Stratification is the key feature that indicates how sedimentary rocks are layered and provides insights into Earth's history.
Explanation:
Stratification is the feature that tells you how a sedimentary rock is layered. It is the process responsible for the formation of layers in sedimentary rocks. Layers in sedimentary rocks can provide valuable information on Earth's history, with deeper layers being older than the ones at the top.
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