1. Atmosphere

2. ATMOSPHERE
Atmosphere- the air that surrounds the Earth. A mixture of gases that surrounds the Earth
2 abundant (plentiful) gases-
Nitrogen (78% of the atmosphere)
Oxygen (21% of the atmosphere)
Other (1%)

3. ALTITUDE
Altitude- elevation above sea level. The higher into the atmosphere, the higher the altitude.
Pressure- amount of force pushing on a surface. Pressure DECREASES the higher the altitude
Temperature- how warm or cold the area is. Temperature varies through each layer.
Density- the amount of mass per volume. Density DECREASES the higher the altitude

4. The atmosphere is divided into 4 layers due to temperature change in each layer.

5. 4 Layers of the Atmosphere
Troposphere- the area we live, where all weather happens.
Stratosphere- Jets fly in this area, ozone layer here absorbing ultraviolet radiation for the sun.
Mesosphere- Meteoroids burn up here.
Thermosphere- layer that reaches outer space. VERY HOT, because energy from the sun hits here first.
The thermosphere is divided into two parts
Ionosphere- brilliant light displays (aurora borealis) happen here due to the particles from the sun interaction with the oxygen and nitrogen
Exosphere- satellites can orbit here.