Which of the following layers of earth’s atmosphere is the coldest layer?

Answer: [C] Mesosphere

Temperatures can reach lows of -90 degrees Celsius in the mesosphere, making it the coldest layer of the earth's atmosphere. The mesosphere extends above the stratosphere and ranges from 50 km to 87 km above the surface.  

This question is a part of GKToday's Integrated IAS General Studies Module