volume of earth
Volume of Earth's Oceans The volume of water in the oceans is enormous: 1.37 billion cubic kilometers (1.37 Ã 10 9 km 3, or 0.328 Ã 10 9 mi. 3). 1.37 Ã 10 9 km 3. Ocean and Oceanography. Microsoft Encarta. The world ocean covers 71 percent of the earth's surface, or about 361 million sq km (140 million sq mi). Its average depth is 5,000 m (16,000 ft), and its total volume is about 1,347,000,000 cu km (322,300,000 cu mi)..