Question

3. The approximate height of the atmosphere
is​

Answer 1

Answer:

It extends from Earth's surface to an average height of about 12 km (7.5 mi; 39,000 ft), although this altitude varies ...

Answer 2

39,000 ft

It extends from Earth's surface to an average height of about 12 km although this altitude varies from about 9 km at the geographic poles to 17 km at the Equator, with some variation due to weather.