|1. Air close to the Earth's surface is heavier|
|2. Air close to the Earth's surface contains large quantity of water vapour and dust particles.|
A) 1 only
B) 2 only
C) Both 1 and 2
D) Neither 1 nor 2
Correct Answer: C
Solution :At higher altitude air is lighter while close to earth surface its heavier In Troposphere the dust particles and water is more than upper layer.
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