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:

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

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World Geography
The Penumbra is

both (a) and (b)
formed by the tangent that intersects between the sun and the moon
the outer portion of the moon's shadow
None of these

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