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Q: Which of the following is the uppermost layer of the atmosphere?
  • A. Stratosphere
  • B. Mesosphere
  • C. Ionosphere
  • D. Exosphere
Correct Answer: Option D - Though the atmosphere extends upto 10000 km but its 99% constituent lie upto 32km. Exosphere is the outermost layer of the earth. It extends from 640 km to 10000 km of altitude.
D. Though the atmosphere extends upto 10000 km but its 99% constituent lie upto 32km. Exosphere is the outermost layer of the earth. It extends from 640 km to 10000 km of altitude.

Explanations:

Though the atmosphere extends upto 10000 km but its 99% constituent lie upto 32km. Exosphere is the outermost layer of the earth. It extends from 640 km to 10000 km of altitude.