The key to Harry Hess's initial understanding of the young age of the seafloor lay is in the measurement of

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Hess's understanding of the young age of the seafloor was significantly influenced by the observation that the average thickness of sediment on the seafloor was much less than expected if the seafloor were ancient. This observation suggested that the seafloor was being continuously renewed.

The Key to Harry Hess's Initial Understanding of the Young