The atmosphere extends upto a height of 10,000 km. It is divided into the following four thermal layers:

1. Mesosphere

2. Stratosphere

3. Thermospher

4. Troposphere

The correct sequence of these layers starting from the surface of the earth upwards is

- 1
  
  2, 4, 1, 3
- 2
  
  4, 2, 1, 3
- 3
  
  4, 2, 3, 1
- 4
  
  2, 4, 3, 1

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