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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.
Land classification during the Sangam period
S.No. | Landscape | Attribute |
| 1 | Kurinji | Moutain and its associated land forms. |
| 2 | Mullai | Forest and its related land forms. |
| 3 | Marutham | Agricultural and its adjoining areas |
| 4 | Neithal | Sea and its surroundings. |
| 5 | Palai | Desert region |
