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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.
Some beaches on Hawaii's Big Island even have a greenish tint, thanks to the presence of the mineral olivine. Old beach, new beach. As a final sandy thought, consider the fact that the sand on most of our beaches, especially on the East and Gulf Coasts, is rather old: some 5,000 years or so, Williams said.Very little new sand reaches the coast nowadays from the continental interior as it once did.s a final sandy thought, consider the fact that the sand on most of our beaches, especially on the East and Gulf Coasts, is rather old: some 5,000 years or so, Williams said.