Consider the following statements1. Nearly 99 percent 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 a maximum at about 60km from earth's surface.Which of the statements given above is / are correct ?

Consider the following statements1. Nearly 99 percent of the total mas

1.	Consider the following statements1. Nearly 99 percent 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 a maximum at about 60km from earth's surface.Which of the statements given above is / are correct ?
A.	1 only
B.	2 only
C.	Both 1 and 2
D.	neither 1 nor 2
Answer» B. 2 only