Sea:
Sea is the expansion of salt water that covers most of the earth’s surface and surrounds its land masses. It covers 70.8% of the earth’s surface. The sea moderates the earth’s climate and has important roles in the water cycle, carbon cycle and nitrogen cycle. The sea is an essential aspect of human trade, travel, mineral extraction and power generation. Seas are smaller but generally larger than lakes and contain salt water.
Ocean:
Ocean is a very large expanse of the sea, in particular each of the main areas into which the sea is divided geographically. Ocean is a body of saline water that composes much of planet’s hydrosphere. On Earth an ocean is one of the major conventional divisions of the World Ocean which occupies two-third of the planet’s surface. Earth is the only planet to have the ocean. The ocean contains 97% of the earth’s water.
Differences:
| Basis | Sea | Ocean |
|---|---|---|
| Definition (www.oxforddictionaries.com) |
The expanse of salt water that covers most of the earth’s surface and surrounds its land masses | A very large expanse of sea, in particular each of the main areas into which the sea is divided geographically |
| Synonyms | Profusion, breaker, marine, swell, profusion, lake | Abundance, tide, mass, multitude, high seas, quantity |
| Antonyms | Beach, area, cape, champaign, base, ball, basis | Sky, land, rivulet |
| Types | The seas are: Mediterranean, Bering, Caribbean, Baltic, Black, Coral, North, Red, Yellow, Caspian and Dead Sea. | The Earth’s main seven oceans are: Arctic, North Atlantic, South Atlantic, North Pacific, South Pacific, Indian and Antarctic Ocean. |
| Word origin | The word sea was originated from Old English sǣ, of Germanic origin; related to Dutch zee and German See. | The word ocean was originated from Middle English: from Old French occean, via Latin from Greek ōkeanos ‘great stream encircling the earth’s disc’. ‘The ocean’ originally denoted the whole body of water regarded as encompassing the earth’s single land mass. |
| Size | Seas are smaller than oceans. | Oceans are enormous. |
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