An airplane flying at high altitude would most likely be in the; Troposphere Stratosphere Mesosphere Exosphere

## Step 1<br />The Earth's atmosphere is divided into several layers, each with its own unique characteristics. These layers, starting from the Earth's surface, are the Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere.<br /><br />## Step 2<br />The Troposphere is the layer closest to the Earth's surface, where weather phenomena occur. This layer extends up to about 8 kilometers (5 miles) at the poles and about 17 kilometers (11 miles) at the equator.<br /><br />## Step 3<br />The Stratosphere is the layer above the Troposphere, extending from about 10 kilometers (6 miles) to about 50 kilometers (31 miles) above the Earth's surface. This layer is characterized by a temperature inversion, meaning the temperature increases with altitude.<br /><br />## Step 4<br />The Mesosphere is the layer above the Stratosphere, extending from about 50 kilometers (31 miles) to about 85 kilometers (53 miles) above the Earth's surface. This layer is where most meteors burn up upon entering the Earth's atmosphere.<br /><br />## Step 5<br />The Thermosphere is the layer above the Mesosphere, extending from about 85 kilometers (53 miles) to about 600 kilometers (372 miles) above the Earth's surface. This layer is where the International Space Station orbits the Earth.<br /><br />## Step 6<br />The Exosphere is the outermost layer of the Earth's atmosphere, extending from about 600 kilometers (372 miles) to about 10,000 kilometers (6,200 miles) above the Earth's surface. This layer is where the atmosphere merges into space.<br /><br />## Step 7<br />Commercial airplanes typically fly in the lower part of the Stratosphere, at altitudes ranging from about 10 kilometers (6 miles) to about 15 kilometers (9 miles). This is because the Stratosphere provides a stable environment with little turbulence, which is ideal for commercial flight.