16b) Assume that the earth as a sphere of radius 6400 km. 

(i) If the average density of the earth is 5500 kg per cubic meter, estimate the mass of the earth.

(ii) If 70% of the earth is covered by water, find the earth's surface area covered by the land.

Video solution watch:

https://youtu.be/Qnub7zWivYg?si=fVHgpDTKY5QAiNtZ

 

Playlist of Exercise 7.2 Compulsory Maths class 9:

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