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Difficulty: MediumAtmosphere and Weather

Earth's atmosphere is divided into distinct structural layers characterized by unique temperature gradients and altitudes. In what order do these atmospheric layers occur from lowest altitude (closest to Earth's surface) to highest altitude?

  1. 1Troposphere
  2. 2Stratosphere
  3. 3Mesosphere
  4. 4Thermosphere

Answer

Troposphere → Stratosphere → Mesosphere → Thermosphere
Moving upward from Earth's surface, the atmospheric layers progress in sequence: Troposphere (ground level to 12 km), Stratosphere (12 to 50 km), Mesosphere (50 to 85 km), and Thermosphere (85 to 600 km).

Step-by-Step Solution

1
Identify the base atmospheric layer directly contacting Earth's surface
Troposphere (0 to ~12 km)
The troposphere is the densest layer where ground heating drives convection and weather.
2
Identify the second layer positioned immediately above the tropopause
Stratosphere (~12 to ~50 km)
The stratosphere lies directly above the troposphere and contains the ozone layer that absorbs ultraviolet radiation.
3
Identify the third layer where temperatures drop to their lowest levels
Mesosphere (~50 to ~85 km)
The mesosphere sits above the stratosphere and is where most meteors disintegrate upon atmospheric entry.
4
Identify the upper high-temperature layer located above the mesopause
Thermosphere (~85 to ~600 km)
The thermosphere is the uppermost layer among these choices, characterized by solar X-ray absorption and auroral activity.

Key Concept

Vertical thermal stratification of Earth's atmospheric layers
Estimated Time:45s
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Topics

Atmosphere and Weather

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