1. A “blanket” or “ocean” of air.
The Atmosphere
A “blanket” or “ocean” of air.

2. Layers of the Atmosphere
There are 5 layers of the Earth’s Atmosphere:
Exosphere (highest)
Thermosphere
Mesosphere
Stratosphere
Troposphere (lowest)
Resources to find properties of these layers include:
Your Cat. Events Book – Pages 34-36
Your ScienceSaurus Book – Pages
The Atmosphere and Ozone Layer BrainPOP Video
The first page of your Atmosphere Lab

3. Composition of the Atmosphere
Most of the gases came from volcanic eruptions.

4. Where did the oxygen in our atmosphere come from?
Oxygen is arguably the most important gas in our atmosphere (for us).
Our first atmosphere blew away and our second didn’t have any oxygen for a long time.
A primitive type of bacteria called Stromatolies were one of the first to use photosynthesis and produced tons of oxygen.

5. Our Protective Invisible “Force Field”