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, From the aspect of the diversity of global biological resources, the samples of biological science research are provided; 4. there are abundant economic fish and algae resources in the ocean, which provide food, grease, chemical materials, drugs, etc. for human beings; 5. there are abundant mineral resources on the seabed, and the proportion of deep-sea manganese nodules is an almost endless treasure, The seabed also has abundant oil, natural gas and combustible ice reserves; 6. the tidal changes of the ocean contain almost infinite power generation energy; 7. marine transportation is one of the most efficient transportation modes at present, Port cities near the sea can generally get rapid development; 8. the ocean is also the ultimate purification plant of global pollutants; 9. marine risks. Large tsunami and typhoon often cause great disasters to human beings; 10. due to climate change, the expected sea level rise will inundate many coastal low-lying cities, which can not be estimated for the potential loss of human beings.<br>
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