On the earth, the ocean occupies 71% of the area. The significance of the ocean to human beings is as follows: 1. Modern scientific research shows that the earliest life originated from the ocean, which can be said to be the cradle of human life; 2. There are abundant water resources in the ocean, which bear the operation of the global water circulation system, and affect or even determine the global climate change; 3. There are abundant biological resources in the ocean, In terms of the diversity of global biological resources, it provides specimens for biological science research; 4. There are abundant economic fish and algae resources in the ocean, providing food, oil, chemical materials, medicine and so on; 5. There are abundant mineral resources in the seabed, and the proportion of deep-sea manganese nodules is an almost endless treasure, There are abundant reserves of oil, natural gas and combustible ice on the sea floor; 6. The tidal change of the ocean itself contains almost unlimited power generation energy; 7. Marine transportation is one of the most efficient transportation modes at present, Port cities close to the ocean can generally develop rapidly; 8. The ocean is also the ultimate purification plant of global pollutants; 9. The ocean contains risks. Large tsunamis and typhoons often cause huge disasters to human beings; 10. Due to climate change, the expected sea level rise will inundate many coastal low-lying cities, and the potential loss to human beings is immeasurable.<br>
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