Relative Age of Rock Layers
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Relative Age Dating Cross Section A
The oldest rock on our planet, oldest rock, ancient rock, shield, craton, 4 billion years old.
Types Of Rocks | The Dr. Binocs Show | Learn Videos For Kids
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I bought the world's oldest rock...(kinda)
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EARTH AND LIFE SCIENCE - Formation of Rock Layers
Earth's History: Sec. 2: Determining Ages of Rocks
