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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
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Presentation Transcript
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
MID-ATLANTIC RIDGE1 - 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)
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)
rocks on ocean bottom reflect earth’s magnetic reversals
THEREFORE: new rocks are forming
MAGNETIC REVERSAL INDICATORS(B3, Figure 10)
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.
