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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 l.jpg

B40b

SEAFLOOR SPREADING

Atlantic Getting Bigger


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SEAFLOOR SPREADING

  • Idea that the ocean bottom is getting larger.

  • Atlantic Ocean

  • Proposed by Harry Hess

  • Evidence in rocks on ocean floor.


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mid-ocean ridge

found running down center of Atlantic Ocean

series of mountains on either side

MID-ATLANTIC RIDGE


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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)


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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)


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rocks on ocean bottom reflect earth’s magnetic reversals

THEREFORE: new rocks are forming

MAGNETIC REVERSAL INDICATORS

(B3, Figure 10)


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ASSIGNMENT reversals

  • 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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