depth of oceans

The average depth of the oceans is about 4 km. More precisely the average depth is 3,688 meters (12,100 ft). Nearly half of the world’s marine waters are over 3,000 meters (9,800 ft) deep.[19] “Deep ocean,” which is anything below 200 meters (660 ft.), covers about 66% of Earth’s surface. This figure does not include seas not connected to the World Ocean, such as the Caspian Sea.

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