High School

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The Earth's radius is approximately 4000 miles. About two-thirds of the Earth's surface is covered by water. Estimate the land area on Earth.

Answer :

9514 1404 393

Answer:

67 million square miles

Step-by-step explanation:

The area of a sphere is given by ...

A = 4πr²

So the area of the Earth is approximately ...

A = 4π(4000 mi)² ≈ 2.01×10^8 mi²

The area of the 1/3 that is not covered by water is approximately ...

(2.01×10^2 mi²)/3 = 6.7×10^7 mi²

The land area is estimated to be about 67 million square miles.

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