The tropopause altitude is highest ________ because of the ________
A) during both the spring and autumn; equal day lengths around the globe
B) during the summer; increased atmospheric pressure
C) during the winter; Sun's direct rays hitting the Tropic of Capricorn
D) at the equator; intense heating from the surface
E) at the poles; diffuse solar radiation
D
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Indicate whether the statement is true or false
Which of the following molecules is most likely to show a dipole-dipole interaction?
A. CH4
B. H-C 
C-H
C. CO2
D. H2S
E. none of the above
In some countries of the world, food supplies are insufficient to provide the entire population with a nutritious diet
Indicate whether the statement is true or false.
In which thermal atmospheric layer is one likely to find noctilucent clouds?
A) thermosphere B) mesosphere C) exosphere D) stratosphere E) troposphere