World Geography
The thickness of biosphere is

10-12 km above the earth's surface
8-10 km above the earth's surface
5-10 km above the earth's surface
5-8 km above the earth's surface

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World Geography
The Harmattan is

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

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World Geography
Which among the following statements is/are correct about Dust particles in the Earth’s atmosphere?Higher concentration of dust particles is found in equatorial and polar regionsThey are generally found in the lower layers of the atmosphereSelect the correct code from the options given below:

Both 1 & 2
Only 2
Only 1
Neither 1 & 2

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