Compared to the planet's average radius (6371 km or 3959 mi), the atmosphere is like the thin skin of an apple. About 99% of the atmosphere's mass occurs within about 32 km (20 mi) of Earth's surface. Hence, the thickness of the atmosphere represents only about _____ % of the total radius of the Earth-atmosphere system.
3 answers
2
no, 3
Actually, the answer is approximately 0.5%, which means that the thickness of the atmosphere represents only about 0.5% of the Earth's total radius.