In studies of rock obtained from ocean basins all over Earth, the oldest ages obtained are approximately 200 million years before the present. Why have no older oceanic rocks been discovered

Due to tectonic activity, rocks on the ocean floor are continually recycled.

Explanation:

Tectonic activities are frequently occurring in the ocean and this results in the continuous recycling of rocks in the ocean floor and this is why it has been impossible to discover rock samples older than 200 million years ago in the ocean.

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