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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

B40b

SEAFLOOR SPREADING

Atlantic Getting Bigger

seafloor spreading2
SEAFLOOR SPREADING
  • Idea that the ocean bottom is getting larger.
  • Atlantic Ocean
  • Proposed by Harry Hess
  • Evidence in rocks on ocean floor.
mid atlantic ridge
mid-ocean ridge

found running down center of Atlantic Ocean

series of mountains on either side

MID-ATLANTIC RIDGE
rock ages
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)

slide5
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)

magnetic reversal indicators
rocks on ocean bottom reflect earth’s magnetic reversals

THEREFORE: new rocks are forming

MAGNETIC REVERSAL INDICATORS

(B3, Figure 10)

assignment
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.