The mean radius of the earth is 6,371 km, and 70.8% of its surface is covered by water. what is the surface area of the earth covered by land?

147,558,601 sqkm

Explanation:

The earth is spherical in shape;

area of sphere = 4πr²

if 70.8% is covered by water then 100-70.8 will be land,

= 29.2%

area occupied by land = (29.2/100) * 4πr²

                                = 0.292*4*3.142*(6371)²

                        =147,558,601 sqkm

it is the most commonly accepted one