Theory:

Oceans
  • Oceans are vast expanse of water.
  • Two-third of Earth is covered by water.
  • Seas are water bodies partially or fully enclosed by land.
Five oceans of the Earth are:
Pacific Ocean
Atlantic Ocean
Indian Ocean
Southern Ocean
Arctic Ocean
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Imporatance of Ocean
  • Oxygen supply: The ocean produces over half of the world's oxygen. It absorbs 50 times more carbon dioxide than our atmosphere.
  • Climate regulation: Ocean covers 70 per cent of the Earth's surface, thereby transporting heat from the equator to the poles through ocean currents, regulating our climate and weather patterns.
  • Transportation: Right from historical times, Oceans serves as an important means of transport.
  • Recreation: Beaches serves as a recreational spot attracting millions of tourists.
  • Economic benefits: Marine shipping contributes significantly to the employment generation and also to GDP.
  • Food: Ocean serves as a source of livelihood for millions of people, right from small fishermen fishing on the shores to Fish factories (in Japan).
  • Medicine: Ocean provides many medicinal products, including ingredients that help fight cancer, arthritis, Alzheimer's disease, and heart disease.