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The Theory of Sea Floor Spreading

The Theory of Sea Floor Spreading. Page 99. 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.”. HESS (1960). Sea floor spreading Continents were moving (as Wegener had proposed)

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The Theory of Sea Floor Spreading

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  1. The Theory of Sea Floor Spreading Page 99

  2. 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.”

  3. HESS (1960) • Sea floorspreading • Continents were moving (as Wegener had proposed) • Evidence 1. 2. 3.

  4. 1. The discovery of the Mid-ocean Ridge • Scientists mapped 47,000 miles of underwater volcanic ridges by using sonar

  5. Map of Mid-ocean Ridges

  6. 2. Ocean floor shows Magnetic Poles reversing

  7. 3. Ocean floor samples—older crust is further away from ridges

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