alleryStart learning →Which layer of the atmosphere extends up to about 12 km and holds roughly 80% of its mass?
AThe mesosphere
BThe stratosphere
CThe troposphere
DThe thermosphere
Answer & Solution
Correct answer: C. The troposphere
1. The layers run outward as troposphere, stratosphere, mesosphere, thermosphere and exosphere.
2. The troposphere is the lowest layer, reaching up to about 12 km above sea level.
3. Because air is densest near the ground, this thin lowest layer carries roughly 80 percent of the atmosphere's mass.
4. Most weather events also originate there, and both air density and temperature fall as you climb through it.
5. The stratosphere sits from about 12 to 50 km, so it is higher and far less massive, which makes it the tempting wrong answer.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.1 Gas Pressure_
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