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"Okeanos (Oceanus) in Greek) is a major body of saline water, and a principal component of the hydrosphere. Approximately 71% of the Earth's surface (an area of some 361 million square kilometers) is covered by ocean"
- Ocean; Wikipedia
By this estimate, Earth is approximately 508.45 million square kilometers.
.71x = 361
x = 508.45
510,072,000 km squared, total. About 30 percent land About 70 percent water See link for more information.
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