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What is “continental drift theory”? Explain.

(OR)

What is the “theory of continental drift”?

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  • Alfred Wagener postulated the theory of continental drift. 
  • It explains the present arrangement of continents and ocean basins. 
  • He postulated a massive super continent called “Pangaea” which existed 220 million years ago. 
  • Present continents originated, by the drift from this “Pangaea”. 
  • Wagener hypothesised that the supercontinent of Pangaea broke up into two blocks 

1) Laurensia, 

2) Gondwana land. 

  • The two blocks were separated by a long shallow inland ocean called “Tethys”. 
  • It took millions of years for the continents to reach the present shape and position.

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