Worldwide, the oldest rocks at the ocean floor are about 180 million years old. In contrast, the oldest continental rocks are approximately 4 billion years old. Give a possible explanation for this large age difference. Hint: Consider which type of lithosphere, oceanic or continental, is denser and therefore more prone to subduction (and destruction) before reaching old age.
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Worldwide, the oldest rocks at the ocean floor are about 180 million years old. In contrast, the old...
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