the theory of sea floor spreading page 99. sea floor spreading harry hess (1960) as the ocean floor...
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Sea Floor Spreading
• Harry Hess (1960)
• as the ocean floor spreads apart, new crust material rises from the mantle and creates new sea floor to fill the “hole.”
1. The discovery of the Mid-ocean Ridge
• Scientists mapped 47,000 miles of underwater volcanic ridges by using sonar
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