What is earth total surface area in kilometers squared

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Question: The radius of Earth is 6,371 km.

a) What's Earth's total surface area in kilometers squared (km2)?

b) Convert Earth's total surface area to squared miles.

c) Explain why the Earth receives an average of 340 W/m2 of energy from the Sun, given that the total solar irradiance (TSI), the power of the Sun at the average Sun-Earth distance (for a surface perpendicular to the rays), is 1,361 W/m2. Where does the factor of 4 come from?

Reference no: EM133401324

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