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Mathematics 7 Online
OpenStudy (anonymous):

Earth's radius is approximately 6400 km. What is the surface area & volume of the earth?

OpenStudy (isaiah.feynman):

If you know the formulas for volume and surface area of a sphere, you can also apply this to your own planet. :)

OpenStudy (kainui):

What's the average density of the earth?

OpenStudy (isaiah.feynman):

5 g/ cm^3. But that's not needed to solve this question.

OpenStudy (kainui):

What's a formula for air pressure as you change altitude?

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