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 a maximum at about 60 km from Earth's surface. Which of the statements given above is/are correct?

Answer: Option A

Nearly 99% of the total mass of the atmosphere lies within 30 km of the Earth's surface. About 99% of the total atmospheric mass is concentrated in the first 20 miles (32 km) above Earth's surface.