Question

the exact thickness of the atmosphere is not known why​

Answer 1

Answer:

the exact thickness of the atmosphere is not known because there are different layers of the earth whose temperature vary from time to time, day by day and year to year. so if the temperature constantly changes it is not possible to know the exact temperature.

Hope it helps you.

Explanation:

Answer 2

Explanation:

The Earth's atmosphere is an extremely thin sheet of air extending from the surface of the Earth to the edge of space. The Earth is a sphere with a roughly 8000 mile diameter; the thickness of the atmosphere is about 60 miles.