How many million square kilometres is the surface area of the earth?

The correct answer is Approximately 510 million square kilometres.Calculation of the Surface area of the earth- The radius of the earth is 6371 km.Assuming the shape of the earth as a sphere, the surface area of a sphere is as follows-4 * pie * R2= 4 * 3.14 (6371)2=approximately 510 million sq.kmThe land consisting of continents and islands of Earth Surface's is about 29 percent.71 percent of the earth is covered with water, this is MOSTLY by oceans but also by rivers, lakes, and freshwater, which together made the hydrosphere.The interior of the earth divided into three different layers are following:–CrustMantleCoreThe outermost solid part of Earth is called Crust.The mantle EXTENDS to a depth of 2900 km from Moho’s discontinuity.The Core is made up of very heavy material and it is mainly constituted by IRON and nickel.So the core is also known as the 'nife' LAYER.