Movement of Earth's continents relative to each other
Continental drift is the hypothesis, originating in the early 20th century, that Earth's continents move or drift relative to each other over geologic time. The hypothesis of continental drift has since been validated and incorporated into the science of plate tectonics, which studies the movement of the continents as they ride on plates of the...
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it's kind of the coolest thing ever that there's a bit of appalachia across the atlantic