The area of the earth's surface covered by land = 6.03 * 10⁷ square miles.
Given that the diameter of the earth is 8,000 miles.
So, the radius of the earth (r) = 0.5 * diameter = 0.5 * 8000 miles = 4000 miles.
Therefore, the total surface area of the earth, which is a sphere is given as,
A = 4πr² = 4π(4000)² square miles.
Now, we are given that 70% of the earth's surface is water.
Therefore, we can say that the remaining surface, that is, 30% of the earth's surface is land.
Hence, the area covered by land on the earth's surface = 30% of the Surface area of the earth
or, Land's area = 30% of A = 0.3 * 4π(4000)² = 0.3 * 2.01062*10⁸ = 6.03 *10⁷.
Therefore, the area of the earth's surface covered by land = 6.03 * 10⁷ square miles.
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