9) This question asks us to find the surface area of Earth. We are given the diameter of Earth, in kilometers. We can approximate Earth as a sphere, and use the equation for the surface area of a sphere.
Before we go ahead and plug in our given value we need to consider a few things. Firstly, we are given the diameter of the Earth, so we need to divide by 2 to find the radius. Additionally, we want the surface area in square meters, but the diameter is given in kilometers.
Answer: B
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