61.
The layer of the atmosphere which provides ideal conditions for flying on jet aeroplanes is ________

62.
Because of which one of the following factors, clouds do not precipitate in deserts?

63.
Which one among the following local winds is not characteristically hot and dry?

64.
Which one of the following characteristics is not associated with the tropical cyclones?

65.
In the atmosphere of the primitive earth there was no ________

66.
Winds and air currents differ in the aspect that ________

67.
Lapse rate is related to the decrease of ________

68.
The most abundant element in the Earth's atmosphere is

69.
A temperature inversion is most likely to occur under which of the following conditions?

70.
The final boundary between the Earth and the outer space is called

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