Profile of Water:
1. Water makes up about 71% of the Earth’s surface
2. Rest 29% of the earth consists of continents and islands.
3. 96.5% of all the Earth’s water is contained within the oceans as ‘Salt Water’
4. The remaining 3.5% is freshwater lakes and frozen water locked up in glaciers and the polar ice caps
5. If you could melt all the ice, and the Earth’s surface was perfectly smooth, the sea levels would rise to an altitude of 2.7 km.

6. 4. The amount of water that exists as groundwater, rivers, lakes, and streams constitute little over 0.7%.

7. 5. Scientists calculate that the total mass of the oceans on Earth is 1.35 x 1018 metric tonnes, which is 1/4400 the total mass of the Earth.
>>>> In other words, while the oceans cover 71% of the Earth’s surface, they only account for 0.02% of our planet’s total mass.

1. 6. According to the study conducted by the Woods Hole Oceanographic Institution (WHOI) in Woods Hole, Massachusetts, the world’s oceans date back 4.6 billion years.
8. The Ancient Greeks gave the word ‘ocean

Some interesting Information about the number of Oceans:

The number of oceans in the world varies on how you look at it.

9. Ancient Greed believed that there were only 7 seas, the Mediterranean, the Caspian, the Adriatic, the Red Sea, the Black Sea, the Persian Gulf and the Indian Ocean.
10. From the scientific point of view there is only one major ocean called the World Ocean.
11. If you include inland seas such as the Black Sea and Caspian Sea, then there are 3 Oceans.
12. Another way to look at it is to divide the world ocean by the different continents and other major geographic regions it touches. Using this method there are 5 oceans.
i. Atlantic Ocean ii. Pacific iii. Southern Ocean (Antarctica)
iv. Indian Ocean v. Arctic Ocean

Note: This division of ocean is widely accepted especially in Geographical understandings.
Note: According to this division, the Black Sea and Caspian Sea are neither seas nor oceans but ‘Lakes’.