The mesosphere (from the Greek words mesos = middle and sphaira = ball) is the layer of the Earth's atmosphere that is directly above the stratosphere and directly below the thermosphere. The mesosphere is located about 50 to 85 kilometers (30 to 50 miles) above the Earth's surface. The stratosphere and mesosphere are referred to as the middle atmosphere.
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mesosphere The atmospheric layer above the stratosphere, extending from about 50 to 85 kilometers altitude.
