Mesopause meaning

mĕz'ə-pôz', mĕs'-
An atmospheric area about 80 kilometers (50 miles) above the earth's surface, forming the upper boundary of the mesosphere.
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An atmospheric transition zone or shell located between the mesosphere and the thermosphere at an altitude of c. 80 to 85 km (c. 50 to 53 miles) in which temperatures begin to rise with increasing altitude.
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The boundary between the upper mesosphere and the lower thermosphere , approximately 80 km (50 mi) above the Earth's surface. It is the site of the coldest temperatures in the Earth's atmosphere, with temperatures of −100°C (−148°F).
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In the atmosphere, the boundary between the mesosphere and the ionosphere. It is the atmospheric boundary where the temperature reaches its minimum value.
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