|Consider the following statements:|
|1. Nearly 99% of the total mass of the atmosphere lies within 30 km of the Earth's surface.|
|2. The proportion of ozone in the atmosphere increases to maximum at about 60 km from Earth's surface. Which of the statements given above is/are correct?|
A) Only 1
B) Only 2
C) Both 1 and 2
D) neither 1 nor 2
Correct Answer: A
Solution :[a] The atmosphere has a mass of about \[5.15\times 1018\,kg,\]three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface. The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space.
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