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Question

The major portion of the atmosphere is:
  1. troposphere
  2. stratosphere
  3. mesosphere
  4. thermosphere

A
stratosphere
B
mesosphere
C
troposphere
D
thermosphere
Solution
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Thermosphere is the main portion of the atmosphere. This portion extends from 85 km to 600 km above earth. In this region, high energy ultraviolet radiation (λ<100nm) penetrates to approx 200 km.
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