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Option 4 : Africa
- Africa, the second largest continent, is known as the "Dark Continent".
- It was given this name because its remained unknown for thousands of years.
- Australia, the smallest continent, is known as the "Island Continent".
- Asia is the largest continent and covers one-third of the earth's surface.
- Antarctica is the coldest, driest, windiest and the emptiest place on Earth.
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