Earth Science Which layer is considered the middle layer? February 2, 2026 by Mercier | Leave a Comment The middle layer of the Earth’s atmosphere is the mesosphere. Located above the stratosphere and below the thermosphere, the mesosphere extends from about 50 to 85 kilometers (31 to 53 miles) above the Earth’s surface. In this layer, temperatures decrease with altitude, making it the coldest atmospheric layer. What is the Mesosphere? The mesosphere is […] Read more ยป