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Paperback. Publisher: most of China Map Publishing Earth's surface is ocean. land accounts for only a small part. The total surface area of??about 51.000 square kilometers. including the sea area of??about 36.000 square kilometers. an area of??Table 70.8% of the total area; land area of??about 14.900 square kilometers. an area of??the table for 29.2% of the total area of. That is the seventh of the surface of the Earth is ocean. and one-third of the land. The surface of the land by the sea divided into different sizes of many pieces. usually the ocean surrounded by a large area of??land called the mainland. the small piece of land called the island. Continent and its nearby islands collectively known as Chau. In this way. the surface of the land is divided into six continents: Asia and Europe. the African continent. the continent of North America. the South American co...