Ocean is a very large expanse of aquatic part located on the earth.

Ocean in the form of the key link for the existence of the Earth: Ocean proves to be an important link for the earth.

Their nature is explained by the following points:

1. There is a rapid increase in population on the earth at present and the problem of food crisis for the humans is increasing constantly. In such a situation, the fish resources found in the oceans are proving to be a boon for the human community living on earth. 

2. As a result of the huge water body found in the oceans, the process of evaporation takes place by the effect of insolation. Due to this process, the process of precipitation takes place. 

3. Availability of water makes the earth a unique planet. 

4. Due to availability of water in the oceans, the expanse of the oceans has created a biotic environment. 

5. Oceans prove helpful in maintaining the water level on the earth’s surface. 

6. The vast expanse of oceanic water controls the temperature of the earth. If the oceans were not there, the temperature on earth would become excessive, and life would not be possible. 

7. Due to the oceans, the condition of variations in temperature and atmospheric pressure occurs, or else, the condition of the winds would always be the same. 

8. The first oxygen was produced in the oceans, due to which the oceans provided the basis of the origin of living – organisms. 

9. Various types of minerals are obtained from the oceans which are the basis of the economic strength of the human community living on the earth. 

10. Oceans have played an important role in the transportation and search of new areas from ancient times to present time.

It is clear from all the above facts that oceans are the basis of the biological community found on earth. If there were no oceans, then the earth would be a deserted planet.