Nearly all the weight and pressure of the atmosphere is below 50 km altitude.

Name: Nearly all the weight and pressure of the atmosphere is below 50 km altitude.
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Quizplus · Accepted Answer

This is because the atmosphere decreases in density and pressure as you move higher in altitude. The majority of the atmosphere is located close to the Earth's surface, with around 90% of the atmosphere's mass below an altitude of 16 km. By 50 km altitude, the air pressure is only about 1% of the pressure at sea level.

Nearly All the Weight and Pressure of the Atmosphere Is