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Question

Difficulty: MediumInternal and External Structure of the Earth

Arrange the principal layers of the Earth's atmosphere in order of increasing altitude, starting from the layer closest to the Earth's surface up to the outer boundary.

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

Answer

The correct atmospheric order from the Earth's surface outward is: Troposphere, Stratosphere, Mesosphere, and Thermosphere.
Starting from the Earth's surface moving outward, the atmospheric layers are encountered in sequence based on altitude: Troposphere (0–12 km), Stratosphere (12–50 km), Mesosphere (50–85 km), and Thermosphere (85–600 km).

Step-by-Step Solution

1
Identify the atmospheric layer touching the Earth's crust
The Troposphere is the lowest atmospheric layer touching the ground.
The Troposphere contains over 75% of atmospheric mass and is adjacent to the surface.
2
Identify the second layer containing the ozone region
The Stratosphere sits immediately above the tropopause.
It extends from ~12 km to 50 km above the surface.
3
Determine the middle layer
The Mesosphere lies between 50 km and 85 km altitude.
It forms the middle layer of the upper atmosphere above the stratopause.
4
Identify the outer high-temperature layer
The Thermosphere extends above 85 km.
It forms the upper structural boundary before merging into the exosphere.

Key Concept

External Structure of the Earth - Stratification of the Atmosphere
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Topics

Internal and External Structure of the Earth

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