Because of the seasonal change in average temperature, the tropopause is lower in ______ than in ______. A winter ... su

[answerhappygod]

Because of the seasonal change in average temperature, thetropopause is lower in ______ than in ______.
A winter ... summer
B summer ... winter
The vertical air pressure gradient is ______ the air pressuregradient in the horizontal.
A much smaller than
B much larger than
C about the same as
The concentration of oxygen in parts per million by volume nearthe summit of Mount Everest is ______ the sea-levelconcentration.
A lower than
B the same as
C higher than
At an altitude of ______ mi., air pressure is less than 1% ofits average sea-level value.
A 1
B 2
C 10
D 20