Question

understand the extension of oceans on the earth​

Answer 1

The area of the World Ocean is about 361.9 million square kilometers (139.7 million square miles), which covers about 70.9% of Earth's surface, and its volume is approximately 1.335 billion cubic kilometers (320.3 million cubic miles). Nearly half of the world's marine waters are over 3,000 meters (9,800 ft) deep.

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Answer 2

Explanation:

A common definition lists five oceans, in descending order by area, the Pacific, Atlantic, Indian, Southern (Antarctic), and Arctic Oceans. ... The world ocean contains 97% of Earth's water, and oceanographers have stated that less than 20% of the oceans have been mapped.