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海洋是海和洋的总称,一般将占地球很大面积的咸水水域称为洋,大陆边缘的水域被称为海。地球四分之三的面积被海洋覆盖,海洋约占地球上总水量的97%,所以有人将地球称为“大水球”。地球四个主要的大洋为太平洋、大西洋、印度洋、北冰洋,大部分以陆地和海底地形线为界。到目前为止,人类已探索的海底只有5%,还有95%的大海海底是人类未知的。
The sea is the general term for the sea and the ocean. The saltwater waters that make up a large area of the globe are generally called the ocean and the waters on the margins of the mainland are called the sea. Three-quarters of the Earth’s surface is covered by oceans, which account for about 97% of the Earth’s total water, so some people call the earth a “water polo.” The four major oceans of the Earth are the Pacific Ocean, the Atlantic Ocean, the Indian Ocean and the Arctic Ocean, most of which are bounded by terrestrial and seabed topographical lines. So far, only 5% of the seabed has been explored by mankind, and 95% of the sea floor is unknown to mankind.