[Answer] Approximately what percentage of Earth's surface is covered in ocean?

Step 1 : Introduction to the question "Approximately what percentage of Earth's surface is covered in ocean?"

...The ocean covers approximately 70.8% of the surface of the Earth — an area of more than 139 million square miles. More than 80% of that ocean territory remains unmapped, unobserved, and unexplored, despite the ocean's overwhelming size and its impact on human life.

Step 2 : Answer to the question "Approximately what percentage of Earth's surface is covered in ocean?"

70%:

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