1. The Atmosphere

2. the state of the atmosphere at a given time and place
weather:
the state of the atmosphere at a given time and place
depends on:
amount of clouds •temperature
air pressure •wind
amount of moisture - precipitation

3. A thick blanket of gases surrounding the Earth
atmosphere
A thick blanket of gases surrounding the Earth
composed of AIR (a mixture of gases)

5. Observe a visual model of Earth's spheres.

6. What gases are in air?
Nitrogen (N) 78%
Oxygen (O) 21%
Also, Carbon Dioxide (CO2), H2O Vapor, and Argon (Ar) in small amounts

7. Earth’s Atmosphere from Space

8. Troposphere:layer of the atmosphere closest to the Earth
where weather happens
Stratosphere: second layer of the atmosphere
where the ozone layer is
where airplanes fly

9. Mesosphere: third layer of the atmosphere
where meteors burn up
Thermosphere: outmost layer of the atmosphere
where auroras happen

11. 3 oxygen atoms bonded together
ozone:
O is an atom of Oxygen (O)
O2 is atmospheric Oxygen (O-O)
O3 is ozone (O-O-O)

12. Absorbs 99% of harmful ultraviolet rays from the sun
ozone layer is about 10 to 20 km thick
thinning is the result of chloroflorocarbons (CFC’s) containing chlorine, fluorine, and carbon

13. This shows a hole in the ozone

14. Almost all of the Earth’s energy comes from the sun and is called radiant energy
most reaches the atmosphere and is reflected back to space

15. As much energy leaves the Earth that comes in ---> Earth’s heat is balanced.
greenhouse effect: trapping of the sun’s energy by the Earth

17. caused by the burning of fossil fuels- coal, oil, and natural gas- adds CO2 into air
warming effect may melt glaciers and raise sea levels