Earth and the Moon are located roughly the same distance away

Earth and the Moon are located roughly the same distance away

Earth and the Moon are located roughly the same distance away

•Earth and the Moon are located roughly the same distance away from the Sun, yet Earth has a permanent atmosphere while the Moon does not. Explain why.•Mercury and Mars have similar surface gravities, yet Mars has a permanent atmosphere while Mercury does not. Explain why.•Earth’s primary atmosphere consisted of hydrogen and helium, yet today it is now mostly nitrogen with some oxygen. Why did Earth’s atmospheric composition change over time?•What fraction of particles will have a speed less than the average speed?

 

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