Question

Of all the earth’s water, how much is of ocean or seas?

Answer 1

71% of the earth is covered with water...
and the oceans hold about 96.5 % of the water on earth.

Answer 2

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▪︎The sea is the interconnected system of all the Earth's oceanic waters, including the Atlantic, Pacific, Indian, Southern and Arctic Oceans.

▪︎However, the word "sea" can also be used for many specific, much smaller bodies of seawater, such as the North Sea or the Red Sea.