Atmosphere

The ozone layer shields the Earth from harmful ultraviolet (UV) rays from the sun.

Satellites orbit in the thermosphere.

Air pressure decreases as altitude increases.

The ozone layer is located in the stratosphere.

The space shuttle orbits in the thermosphere.

The main components of the Earth's atmosphere are nitrogen (78%), oxygen (21%), and trace gases (1%).

The thermosphere is significant because it contains the ionosphere, which is important for radio communication and is where the auroras occur.

In the stratosphere, temperature increases with altitude due to the absorption of UV radiation by the ozone layer.

The ionosphere reflects radio waves back to Earth, enabling long-distance communication.

The boundary is called the tropopause.