1. Atmosphere
Chapter 4
7th Grade

2. Atmosphere What is the Atmosphere? What is it made of?
Does it help or hurt us?

3. Atmosphere
The Earths Atmosphere is a thin layer of air that forms a protective covering around the planet.
Made up of several different gases and contains solids and liquids
Made up of 5 layers

4. Atmosphere
Atmospheric Gases:

5. Atmosphere
The gases in our atmosphere are changing in small but important ways
For example: car exhaust emits CO2 and other gases into the air.

6. Atmosphere Solids and liquids in the atmosphere
Aerosols (Solids): Dust, salt, pollen
Liquids: Water like clouds! But also may contain liquid droplets from erupting volcanoes.. Even if the volcano is thousands of kilometers away from you!

7. Atmosphere Five Layers, in order from the earth to space. Troposphere
Stratosphere
Mesosphere
Thermosphere
Exosphere

8. Atmosphere
Troposphere: Where we are! Rain, snow, and clouds occur in this layer. This layer extends up about 10 Kilometers.

9. Atmosphere
Stratosphere: Extends from 10Kilometers out to 50 Kilometers. Contains higher levels of gas called the Ozone Layer!
We will learn more about the ozone in another section 

10. Atmosphere
Mesosphere: Meteors burn up in this layer.. You also know them as “Shooting stars”! It extends from 50Km to 85Km.

11. Atmosphere
Thermosphere: Named for its high temperatures. The thickest atmospheric layer; it extends from 85Km to 500Km above Earths surface.

12. Atmosphere Small side note!!..
Within the mesosphere and the thermosphere layers there is a layer of electronically charged particles called the Ionosphere. This ionosphere allows radio signal to travel across the country

13. Atmosphere
Exosphere: the outermost layer of our atmosphere. Beyond this layer there is just space. Space shuttles and satellites end up here.
Very few molecules located in this layer.

14. Bell Work On a piece of paper
Identify the 5 layers of our atmosphere in order from the Earth..
Can you tell me something special about each layer?

15. Reinforcement https://youtu.be/w-9gDALvMF4 :6:23-8:00ish

16. Atmosphere
The big picture:

17. Atmosphere Atmospheric Pressure
The higher you go up in the atmosphere, the lower the pressure.
This is because the gravity pulls down on particles/molecules. There are less and less molecules as you go higher and higher into the atmosphere.

18. Atmosphere Temperature in the Atmospheric layers:
The five layers have been divided mainly based on their differences in temperature.

19. State some effects of a thinning ozone layer.
Exit card: Atmosphere
While hiking in the mountains, you notice that it is harder to breathe as you climb higher. Explain why this happens.
State some effects of a thinning ozone layer.

20. Atmosphere The Ozone Layer!!! Within the Stratosphere layer
Made of Oxygen
Oxygen we breathe is made of two oxygen molecules bonded together: O2
An Ozone molecule is made up of THREE oxygen molecules bonded together and protects us from extremely harmful ultraviolet radiation which can cause skin cancer.

21. Atmosphere The Ozone Hole??!!
(CFCs)Chlorofluorocarbons: are compounds used in some refrigerators, air conditioners, and aerosol sprays, and many foam packaging.
Causes the ozone molecule (O3) to break down. Depleting the Ozone!!! Causing a large Hole in our protective Ozone.

22. Atmosphere
How do CFCs do this!!!

23. Atmosphere Ozone hole over time..  Short clip about ozone layer:

24. Bell work
Identify the five layers of the atmosphere in order from the earth (Troposphere,….)
What patterns did you find Friday about the Ozone hole??

25. O-zone!!! Short clip about ozone layer:

26. Cute animation

27. Atmosphere Lets make a model !!! Atmosphere layers Handout
Colored Pencils
Rulers (with mm if possible)
Small item to make Earth (Circle/Cup)

28. Energy Transfer in the Atmosphere
The majority of our energy comes from our Sun!!
This energy allows plants to grow, and drives our wind and ocean currents

29. Energy Transfer in the atmosphere
Heat: is energy that flows from an object with a higher temperature to an object with a lower temperature.
Heat can be transferred through the atmosphere in three ways: radiation, conduction, and convection.

30. Energy transfer in the atmosphere
Conduction, Convection, and Radiation!! Lets make a picture of these three ideas!!

31. Bell work Compare and contrast the following three terms Radiation
Convection
Conduction

32. Energy Transfer in the Atmosphere
Our Earths Atmosphere is unique!!
Radiation from the sun can be reflected back into space or absorbed by land and water.
Once absorbed, heat can be transferred by conduction, convection, and radiation.
Earths atmosphere helps control how much suns radiation is absorbed or lost 

33. Energy Transfer in the Atmosphere
The Hydrosphere: is a term that describes all the water of Earth.
The Water Cycle
What do you know about the water cycle??

34. Energy Transfer in the Atmosphere
The water cycle:

35. A day in the life of a water droplet
Stop and mold animation

36. Show me you remember!! 
What are the 5 layers of our atmosphere and one special thing about each.
What are the two main gases that make up our atmosphere?

37. Show me what you remember! 
Review: I’m thinking of a word….
Infiltration
Transpiration
Precipitation
Condensation
Evaporation
Conduction
Convection
Radiation

38. Air Movement
Wind: movement of air from an area of higher pressure to an area of lower pressure.

39. Air Movement
The Coriolis Effect: causes the air in the northern hemisphere of our earth to turn to the right and the air in the southern hemisphere to turn to the left.

41. Air movement National Geographic article
Lets read about these winds further: Page 105
Identify Polar easterly, Westerly,
Trade winds, and the doldrums area.

42. Air movement Doldrums: windless rainy region close to the equator!
Why? Near the equator, the sun heats the air and causes it to rise, creating low pressure and little wind. The rising air eventually cools and it then rains.

43. Air movement
Jet Stream: Narrow belt of strong winds high in the troposphere blowing in the East direction.
Why is this called the “Jet stream”?

44. Air movement Sea and Land breeze: Sea breeze comes from the sea
Land breeze comes from the land

45. review
Earth Layers

46. Review
Air movements

47. Air Movement
Extended response practice