Continental drift theory flaws
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Continental Drift Theory Flaws . 1 st What force could push large mass over great distances 2 nd How the continents could move were through something solid like earth’s crust They questions were the reasons why Wegener’s theory was rejected until the 1950s. Seafloor Spreading .

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Continental Drift Theory Flaws

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Continental drift theory flaws

Continental Drift Theory Flaws

  • 1st What force could push large mass over great distances

  • 2nd How the continents could move were through something solid like earth’s crust

  • They questions were the reasons why Wegener’s theory was rejected until the 1950s


Seafloor spreading

Seafloor Spreading

  • Until 1900’s most people believed

    • that the oceans floors were flat

    • Ocean floor was not changing

    • Ocean floor was older than continental crust

      War and Technological advancement changed all misconceptions


Wwii sub warfare

WWII Sub Warfare

  • Sonar tech was improved in order to create detailed maps and way to navigate

  • Magnetometers: device that detect small changes in magnetic fields, towed behind boats to locate enemy subs

  • Data from these sources revealed vast underwater mountain chains called ocean ridges and deep sea trenches

  • Text p 474 figure 17.8


Ocean rocks sediment

Ocean Rocks & Sediment

Rock Analysis

  • The age of the rocks varies and the variations were predictable

  • Samples near the ocean ridges were younger than the samples taken near the trenches..


Ocean rocks sediment1

Ocean Rocks & Sediment

Sediment Analysis

  • Thin layers of sediment compared to continents

  • Thickness of sediment increased with distance from an ocean ridge


Seafloor spreading1

Seafloor Spreading

  • Theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep sea trenches

  • Vital key that supports Wegener’s continential drift theory


In class activity

In Class Activity

  • Turn to p 477 figure 17.13

  • P. 478 read Visualizing Seafloor Spreading


Continental drift theory flaws

ANY QUESTIONS?


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