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Why is it that the Pacific Ocean floor is no older than about 200 million years and yet the
continents are much older?

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Nickaiviz

Explanation:

While the Earth's continental crust can exist for billions of years, movement of tectonic plates causes subduction, which is when the ocean crust is shoved down into the molten mantle. So the ocean floor rarely lasts longer than 200 million years

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