Question

Explain the formation of the earth based on the continental drift theory

Answer 1

• The earth was a single sialic land mass called Pangaea surrounded by a huge ocean called Panthalasa whose floor was a mass of sima.
• Pangaea broke into two parts called Laurasia (N. Hemisphere) which lay around equator and Gondwanaland (S. Hemisphere) which lay around south pole which were separated by a narrow ocean called Tethys (the present Mediterranean Sea). 
• Laurasia broke into Laurentian Shield and Fennoscandia (Europe, Asia and N. America) and moved northwards to their present positions.
• Gondwanaland broke into Africa, Australia, S. America and Antarctica and India subcontinent.
• Africa and India drifted northwards.