Theory:

Origin of continents
  • Pangea: the Super Continent.
  • The Sea surrounding Panagea is Panthalassa.
  • These landmasses moved away from each other 200 million years ago to gain the present position as continents and oceans.
  • The Earth is covered by 71 per cent water, and the rest 29 per cent is covered by land.
  • The surface of the Earth is not even. 
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Land classification during the Sangam period
S.No.
Landscape
Attribute
1Kurinji Moutain and its associated land forms.
2MullaiForest and its related land forms.
3MaruthamAgricultural and its adjoining areas
4NeithalSea and its surroundings.
5PalaiDesert region
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