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Best Answer: The age of continental rocks are older than that of sea floor rocks. Ocean crusts form and deplete rapidly, and are generally quite young (180 million years or so for the oldest). Continental crusts generally are older (billions of years) because they deplete slowly, and mainly through erosion.
floor is sea floor spreading. 27 Evidence for Sea Floor Spreading. In the 1960s scientists found evidence that new material is erupting along the mid-ocean ridge. The presence of pillow shaped rocks has showed that molten material has erupted again and again. 28 Pillow Lava rocks. 29 Evidence for Sea-Floor Spreading 31  32 . In the 1968, scientists aboard the Glomar Challenger gathered information about the Sea floor. They found rocks no older than 180 million years. 33 Evidence of Sea-Floor Spreading. Evidence from drilling into the sea floor shows evidence of the ages of rocks.