1. Troposphere

- The troposphere is the lowest layer of the atmosphere, extending from the Earth's surface to about 10 kilometers (6.2 miles) in altitude.

- This is where we live and breathe, and it contains the majority of the Earth's weather and climate systems.

- The temperature in the troposphere generally decreases with increasing altitude, and the air pressure decreases as well.

2. Stratosphere

- The stratosphere extends from about 10 km (6.2 mi) to about 50 km (31 mi) above sea level.

- It is home to the ozone layer, which absorbs the sun's ultraviolet (UV) radiation and protects life on Earth.

- The temperature in the stratosphere increases with increasing altitude, due to the absorption of solar radiation by the ozone layer.

3. Mesosphere

- The mesosphere extends from about 50 km (31 mi) to about 85 km (53 mi) above sea level.

- It is the coldest layer of the atmosphere, with temperatures reaching as low as -90 degrees Celsius (-130 degrees Fahrenheit).

- The mesosphere is also home to the famous "noctilucent clouds", which are composed of ice crystals and are visible only during the summer months at high latitudes.

4. Thermosphere

- The thermosphere is the hottest layer of the atmosphere, with temperatures reaching up to 2,000 degrees Celsius (3,632 degrees Fahrenheit).

- It is composed primarily of molecular nitrogen and oxygen, which are ionized by solar radiation, resulting in the beautiful auroras that are visible in the polar regions.

5. Exosphere

- The exosphere is the outermost layer of the atmosphere, extending from about 85 km (53 mi) above sea level to the edge of space.

- This layer is very thin, with air pressure decreasing rapidly with increasing altitude.

- The exosphere merges with the interplanetary space.