1. The Atmosphere

2. Definition
The layer of gases surrounding Earth; composed mainly of nitrogen and oxygen

3. Layers

4. Troposphere This is where all plants and animals live and breathe
Where weather takes place
Air is mixes
T decreases with altitude

5. Ozone Layer Pale blue gas with a strong odor.
90% of all ozone is found in the stratosphere
10% is found in the troposphere
Ozone is extremely important because it is the only gas that absorbs ultraviolet radiation from the Sun and protects the surface of the Earth and people from the damaging effects of UV rays

6. Stratosphere
Ozone in this layer stops many of the sun's harmful rays from reaching the earth
People can not breathe in this layer.

7. Mesosphere T decreases with altitude
This is where we see "falling stars" – meteors burning up as they fall to Earth

8. Thermosphere
Layer of the atmosphere which is first exposed to the Sun's radiation and so is first heated by the Sun.
The air is very thin
The temperature dependent on solar activity.

9. Ionosphere
An extension or a part of the thermosphere. So technically, the ionosphere is not another atmospheric layer.
Free electrons and ions tend to recombine

11. Exosphere Highest layer of the atmosphere. The air is very thin here
Atoms and molecules escape into space

12. Let’s look at an animation: