Consider the following statements :
1. 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 60 km from earth's surface.
Which of the statements given above is/are correct?

Options

A. 1 only
B. 2 only
C. Both 1 and 2
D. neither 1 nor 2

Answer

A