In which of the following best explains the decrease in temperature with height within the lower layers of the atmosphere?

A. The air receives its heat directly from the sun's rays
B. The earth is the main source of the heat given up to the air  
C. An increases in height is associated with increase in rainfall
D. There are always water particies in the air at high altitudes
E. There is little mixing of air at higher altitudes

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Correct Answer: B