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SEAFLOOR SPREADING

B40b. SEAFLOOR SPREADING. Atlantic Getting Bigger. SEAFLOOR SPREADING. Idea that the ocean bottom is getting larger. Atlantic Ocean Proposed by Harry Hess Evidence in rocks on ocean floor. mid-ocean ridge found running down center of Atlantic Ocean series of mountains on either side.

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SEAFLOOR SPREADING

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  1. B40b SEAFLOOR SPREADING Atlantic Getting Bigger

  2. SEAFLOOR SPREADING • Idea that the ocean bottom is getting larger. • Atlantic Ocean • Proposed by Harry Hess • Evidence in rocks on ocean floor.

  3. mid-ocean ridge found running down center of Atlantic Ocean series of mountains on either side MID-ATLANTIC RIDGE

  4. 1 - youngest rocks nearest the ridge oldest rocks next to continents identical pattern on both sides THEREFORE: new rocks are forming ROCK AGES (B3, Figure 9)

  5. 2 - oldest rocks on ocean floor = 200 million years old oldest rocks on continents = 4.6 billion years old THEREFORE: new rocks are forming (B3, Figure 9)

  6. rocks on ocean bottom reflect earth’s magnetic reversals THEREFORE: new rocks are forming MAGNETIC REVERSAL INDICATORS (B3, Figure 10)

  7. ASSIGNMENT • Draw a section of the ocean floor and mantle flanking the mid-Atlantic ridge. • Use different colors to represent different rock ages. • Label: mid-Atlantic ridge and direction of plate movement.

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