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Harry H. Hess, Dan Mckenzie- The seafloor is spreading outward from vast water ridges. The sea floor was created at mid-ocean ridges. (feb 22, 1960 BC – nov 8, 1966)

Added to timeline:

7 months ago
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Sophie Dixon

Date:

feb 22, 1960 BC
nov 8, 1966
~ 3929 years
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