1. Earth’s Atmosphere Why is it so important to life on earth?

2. Atmosphere: The layer of gases surrounding the earth. Atmosphere: The layer of gases surrounding the earth. The atmosphere is composed mainly by Nitrogen and Oxygen. The atmosphere is composed mainly by Nitrogen and Oxygen. 78% Nitrogen, 21% Oxygen, and 1% other gases 78% Nitrogen, 21% Oxygen, and 1% other gases Other gases for example argon are called trace gases. They paly an insignificant role in the atmosphere. Other gases for example argon are called trace gases. They paly an insignificant role in the atmosphere.

3. Importance of the Atmosphere 1) keeps our planet warm (The greenhouse effect) 1) keeps our planet warm (The greenhouse effect) 2) Provides oxygen to breathe 2) Provides oxygen to breathe Makes respiration (breathing) possible. Makes respiration (breathing) possible. 3) Protects us from small meteors. 3) Protects us from small meteors. ** without atmosphere smell, taste, sound, and combustion are not possible. ** without atmosphere smell, taste, sound, and combustion are not possible.

4. Earth’s atmosphere is made up of 5 different layers…

5. Did you know that The Science Monkey’s Took Evan? The Science Monkey’s Took Evan Say it with me…

6. I know you are thinking…what is he talking about??? The The Science Science Monkey’s Monkey’s Took Took Evan Evan MEANS…. MEANS…. Troposphere Stratosphere Mesosphere Thermosphere Exosphere THE FIVE LAYERS OF THE EARTH’S ATMOSPHERE FROM THE EARTH OUT!

7. Why is the atmosphere divided into 5 different layers? Any guesses? The atmosphere is divided into five different layers because the atmosphere is not uniform, its properties change with altitude. The atmosphere is divided into five different layers because the atmosphere is not uniform, its properties change with altitude. Two properties change with altitude, the AIR PRESSURE and the AIR TEMPERATURE Two properties change with altitude, the AIR PRESSURE and the AIR TEMPERATURE Lets look at each layer individually. Lets look at each layer individually.

8. The first layer of the atmosphere is the… The troposphere is the layer of the atmosphere nearest to earth. All weather happens in the troposphere. More than half the air in the total atmosphere is in this layer. The temperature drops as the altitude increases. (the higher you go, the colder it gets) TROPOSPHERE

9. The second layer of the atmosphere is the… The temperature goes up with altitude. The temperature goes up with altitude. It is cold except in its upper region where the ozone is located. It is cold except in its upper region where the ozone is located. Most jets fly in this layer. Most jets fly in this layer. The protective ozone is at the top of the atmosphere (A form of oxygen that protects us from the ultraviolet radiation of the sun.) The protective ozone is at the top of the atmosphere (A form of oxygen that protects us from the ultraviolet radiation of the sun.) STRATOSPHERE

10. The third layer of the atmosphere is the… The mesosphere is the coldest layer of the atmosphere. Meteors burn up in this layer. Radio waves are reflected back to earth in the mesosphere. MESOSPHERE

11. The fourth layer of the atmosphere is the… In the thermosphere the temperature goes up with altitude. In the thermosphere the temperature goes up with altitude. The thermosphere is the hottest layer of the atmosphere. The thermosphere is the hottest layer of the atmosphere. Curtains of light called auroras occur in this layer. (Northern Lights) Curtains of light called auroras occur in this layer. (Northern Lights) Very thin air. Very thin air. Space shuttles orbit here. Space shuttles orbit here. THERMOSPHERE

12. The last layer of the atmosphere is the… The exosphere is the outermost layer of the atmosphere extend into outer space. The temperature in the exosphere goes up with altitude. Satellites orbit earth in the exosphere. EXOSPHERE

13. GOOD LUCK! It is important to understand the different characteristics of the earth’s atmosphere. As you go through the following slides, challenge your partner to see who can name the correct layer in which each characteristic can be found.

14. EXOSPHERE

15. MESOSPHERE

16. THERMOSPHERE

17. TROPOSPHERE

18. STRATOSPHERE

19. THERMOSPHERE

20. MESOSPHERE