The coldest region of the Earth’s atmosphere is__________?

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The coldest region of the Earth’s atmosphere is__________?A. Exosphere
B. Thermosphere
C. Stratopause
D. Mesopause

The top of the mesosphere, called the Mesopause, is the coldest part of Earth’s atmosphere. Temperatures in the upper mesosphere fall as low as −101 °C (172 K; −150 °F), varying according to latitude and season.