Refer to figure.
Troposphere = The lowest layer of our atmosphere. It starts at ground level and extends upward to about 10 km above sea level. Nearly all the weather occurs in this layer mainly because 99% of the water vapour is found here. With increasing altitude, the pressure normally drops and the temperature decreases.

The tropopause is the atmospheric boundary that separates the troposphere from the stratosphere. It marks the end of the troposphere and lies approximately 17 kilometres above the equatorial regions, and approximately 9 kilometres above the polar regions.

Stratosphere = The layer above the troposphere is the stratosphere, it extends from the troposphere to about 50km above the ground. With increasing altitude, the temperature rises, because of this the air here is very stable and there is almost no turbulence. This is the reason commercial passenger jets fly in the lower stratosphere. The lower boundary of the stratosphere is called the tropopause; the upper boundary is called the stratopause.

Mesosphere = The layer above the stratosphere is the mesosphere, it extends from the stratosphere to about 85 km above the ground. With increasing altitude, the temperature decreases. The air pressure here is very low and the coldest temperatures in the Earth’s atmosphere are found here.

Thermosphere = The layer above the mesosphere is the thermosphere, it extends from the mesosphere to about 600 km. The temperature here can get up to thousands of degrees.

Exosphere = The layer above the thermosphere is the exosphere, it extends from the thermosphere up to 150 000 km above the surface of the earth. However, there is no clear upper boundary where the exosphere fades away into space.