The denser packing of molecules at the bottom of the atmosphere than at the top of the atmosphere is a result of ________.
A) the Coriolis effect
B) friction
C) gravity
D) the sorting caused by the varying weights of the gases
E) very good planning at the time of Earth's beginnings
Question 2
The density of air is measured in ________.
A) kilograms
B) cubic meters
C) micrometers
D) kilograms per cubic meter
E) joules