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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.
The result of the addition of new sea floor rock is that the Atlantic Ocean between these sets of continents is widening. North and South America move farther away from Eurasia and Africa each year. The youngest sea floor rocks are found in the middle of the ocean because that is where new sea floor is added.As you move away from the MAR, the sea floor rocks become increasingly older. The oldest sea floor (the first Atlantic sea floor formed that is still preserved) is found closest to the continents.tudents will have calculated an average spreading rate over some period of time. Because the oldest sea floor shown on the map is 156 million years old, it is best to calculate an average spreading rate over some time period longer than about 50 million years.