World Geography
The ratio of the weight of water vapour to the total weight of air (including the water vapor) is called

mixing ratio
specific humidity
relative humidity
absolute humidity

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World Geography
The sequence of layers of atmosphere from earth to upwards is

troposphere, tropopause, stratosphere, stratopause, mesosphere, mesopause, ionosphere(thermosphere, thermopause, exosphere)
troposphere, stratosphere, stratopause, mesosphere , ionosphere
troposphere, tropopause, stratosphere, thermosphere, exosphere
troposphere, tropopause, stratosphere, mesosphere , exosphere, thermosphere, thermopause

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World Geography
The Harmattan is

All of these
tertiary wind that carry great quantities of fine dust from the Sahara
wind that blows during the dry season from December to February
cool, extremely dry wind that forms over the Sahara and blows westward or south-westward to the Af

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