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Listen to native speakers pronounce “metamorphic rock” in real conversational contexts with synchronized timestamps and subtitles.
We can assume the Vishnu Basement Rocks are older than any rocks above them, based on the principle of superposition.And the chunk of igneous rock must be younger than the metamorphic rock it intruded into, because of the principle of cross-cutting relation.Above the basement rocks, the Grand Canyon Supergroup tilts at an angle.
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