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en.wikipedia.org/wiki/Mesosphere

The mesosphere (/ ˈ m ɛ s oʊ s f ɪər /; from Greek mesos, "middle") is the third major layer of the Earth's atmosphere, directly above the stratosphere and directly below the thermosphere. In the mesosphere, temperature decreases as altitude increases.

scied.ucar.edu/shortcontent/mesosphere-overview

Most meteors vaporize in the mesosphere. Some material from meteors lingers in the mesosphere, causing this layer to have a relatively high concentration of iron and other metal atoms. Very strange, high altitude clouds called "noctilucent clouds" or "polar mesospheric clouds" sometime form in the mesosphere near the poles.

www.answers.com/Q/What_is_the_range_of_altitude_for_the_mesosphere

The temperatures in the mesosphere vary mostly by altitude (and of course by season and latitude). The temperature of the upper mesosphere may fall as low as −101 °C (172 K; −150 °F).

scied.ucar.edu/shortcontent/thermosphere-overview

Temperatures in the upper thermosphere can range from about 500° C (932° F) to 2,000° C (3,632° F) or higher. The boundary between the thermosphere and the exosphere above it is called the thermopause. At the bottom of the thermosphere is the mesopause, the boundary between the thermosphere and the mesosphere below.

en.wikipedia.org/wiki/Thermosphere

The thermosphere (or the upper atmosphere) is the height region above 85 km, while the region between the tropopause and the mesopause is the middle atmosphere (stratosphere and mesosphere) where absorption of solar UV radiation generates the temperature maximum near 45 km altitude and causes the ozone layer.

www.windows2universe.org/earth/Atmosphere/mesosphere_temperature.html

Temperature in the Mesosphere The top of the mesosphere is the coldest part of the atmosphere. It can get down to -90° C (-130° F) there! As you go higher in the mesosphere, the air gets colder. The air is much thinner (less dense) in the mesosphere than in the stratosphere below.

quizlet.com/subject/mesosphere

Learn mesosphere with free interactive flashcards. Choose from 85 different sets of mesosphere flashcards on Quizlet.

softschools.com/facts/weather/exosphere_facts/2198

The exosphere is one of the five layers of earth's atmosphere. The other layers include the troposphere, stratosphere, mesosphere, and thermosphere. The exosphere is the fifth and outermost layer of the atmosphere, beginning at the upper boundary of the thermosphere and lower exosphere, referred to as exobase, exopause, and the 'critical altitude'.

www.windows2universe.org/?page=/earth/Atmosphere/mesosphere.html

The mesosphere is a layer of Earth's atmosphere. The mesosphere is above the stratosphere layer. The layer above the mesosphere is called the thermosphere. The mesosphere starts at 50 km (31 miles) above Earth's surface and goes up to 85 km (53 miles) high. As you get higher up in the mesosphere ...

www.answers.com/Q/What_is_the_temperature_range_of_the_thermosphere

Above 120 miles (200 km) above sea level, temperatures in the thermosphere can vary between 600° and 2000°C (1100 and 3600°F). The actual temperature range is highly dependent on solar activity.