Radiometric dating was used to age the ocean floor which was found to be older than the land at the center of continents.

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Radiometric dating is used to age the Earth's crust including the ocean floor. The oceanic crust, however, is only dated to be 200 million years old, whereas, the continental crust is much older at 4 billion years old. This is due to the creation of new crust in the seafloor and the destruction of older oceanic crust. Information can be found in the section Wegener's Idea Is Transformed.

Radiometric Dating Was Used to Age the Ocean Floor Which