World Geography
Which among the following statements is/are correct about the stratosphere?The Stratosphere is the layer of the Earth’s atmosphere which lies beyond the mesosphere.It extends up to an altitude of 50 kilometres from the earth’s surface.This layer is ideal for flying aeroplaneSelect the correct code from the options given below:

1, 2 & 3
Only 1
Only 1 & 2
Only 2 & 3

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World Geography
The Harmattan is

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

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