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Why are the oldest parts of the ocean floor no more than about 200 million old?

User Eljay
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Answer:

Because they are renewed.

Step-by-step explanation:

Oceanic crusts are usually renewed in the Earth's mantle relatively quickly in subduction zones (where tectonic plates collide with each other) due to their high density, and are less than 200 million years old.

User Milind Dumbare
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