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4.3 Drifting Continents. 9/7/06. I. The Theory of Continental Drift. A. Alfred Wegener, German scientist formed a hypothesis on Earth’s continents. B. Wegener’s hypothesis was that all the continents had once been joined together in a single landmass and have since drifted apart.

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I the theory of continental drift
I. The Theory of Continental Drift

  • A. Alfred Wegener, German scientist formed a hypothesis on Earth’s continents.

  • B. Wegener’s hypothesis was that all the continents had once been joined together in a single landmass and have since drifted apart


4 3 drifting continents

  • C. Pangaea = all lands.

  • D. Continental drift - the continents slowly move over Earth’s surface

  • E. Evidence From Landforms

    Mountain ranges in South Africa lined up with a range in South America.


4 3 drifting continents

  • F. Evidence from Fossils -

    Fossils are any trace of an ancient organism that has been preserved in rock.

    Mesosaurus and Lystrosaurus fossils have been found in Africa and South America.





4 3 drifting continents

G. Evidence from Climate

Glaciers were found in South America, Africa, India, Australia, Antarctica


Ii scientists reject wegener s theory
II. Scientists Reject Wegener’s Theory

  • Wegener thought that mountains formed when drifting continents collided, causing their edges to crumple and fold.

  • Mountains usually occur in narrow bands along the edges of continents, as you would expect if the collision of continents forms mountains.