Question

why is the coldest atmospheric layer​

Answer 1

Answer:

The mesosphere

The mesosphere is a layer within the Earth's atmosphere that extends from about 50 kilometres height (above the stratosphere) and about 90 kilometres (below the thermosphere). ... The top of the mesosphere is the coldest area of the Earth's atmosphere because temperature may locally decrease to as low as 100 K (-173°C).

Answer 2

The mesosphere is a layer within the Earth's atmosphere that extends from about 50 kilometres height (above the stratosphere) and about 90 kilometres (below the thermosphere). ... The top of the mesosphere is the coldest area of the Earth's atmosphere because temperature may locally decrease to as low as 100 K (-173°C).

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