1. At 1
1.1ppt
The Air
Around You
W&C Chapter 1.1
Pages 14-19

2. What is Meteorology? The study of weather and the atmosphere
Weather: the condition of Earth’s atmosphere at a particular time and place.

3. Earth’s Atmosphere
Atmosphere is from two Greek words: Atmos and sphaira.
It makes conditions on the Earth suitable for living things
Contains oxygen and other gases living things need.
Is constantly changing.

4. Earth’s Atmosphere The atmosphere helps keep the planet warm
Allows for liquid water
Protects from dangerous radiation
Burns up chunks of rocks (meteoroids) from space (meteors).

5. Composition of Atmosphere
Atoms - the smallest unit of an element that can exist in itself
Molecules - formed by two or more atoms (elements)
Molecules combine to form Gases.

6. Composition of Atmosphere
The Air You Breathe 1%
21%
78%

7. Exit Pass Give up to 3 reasons why the atmosphere is important.
What are the 2 primary gases that our atmosphere is made of?

8. What gas makes up the majority of Earth’s atmosphere?
A. Oxygen (O2)
B. Carbon Dioxide (CO2)
C. Nitrogen (N2)
D. Ozone (O3)

9. Nitrogen Most abundant gas in the atmosphere
One nitrogen molecule contains 2 nitrogen atoms, N2
All living organisms need nitrogen in order to grow and repair body cells.

10. Nitrogen
Nitrogen fixation (the “nitrogen cycle”)must occur to convert N2 into a form that plants can use (Nitrates)
Plants absorb the nitrogen from the soil
Animals eat the plants.

11. Oxygen The second most abundant gas, O2
Oxygen is an important ingredient in the combustion process (fire)
Burning uses oxygen rapidly
Oxygen reacts slowly with metal objects to produce rust
Ozone is made of triple oxygen atoms, O3
Ozone Layer in Stratosphere
Ozone Hole

12. Carbon Dioxide
One molecule has one atom of carbon and two atoms of oxygen
Essential to life
Plants must use CO2 to produce oxygen.
Animals give off CO2 as a waste product.

13. Carbon Dioxide
Fossil fuels increase the amount of CO2 in the atmosphere
Earth’s temperature rises as a result.

14. Other (Trace) Gases
Nitrogen and Oxygen make up 99% of the gases in the atmosphere
Argon and Carbon dioxide make up most of the remaining 1% (trace gases)
Other
Gasses
Percent by Volume
Argon
0.93
Carbon Dioxide
0.036
Neon
0.0018
Helium
Methane
Krypton
Hydrogen

15. Meteorology is the study of…
A. Meteors
B. Weather
C. Precipitation
D. Atmosphere & Weather

16. H2O in the gas state is called…
A. Ice
B. Water Vapor
C. Plasma
D. Mist

17. Water Vapor Water in the form of a gas Varies from place to place.
It is invisible, not the same thing as steam
Varies from place to place.
Desert, Polar Ice Caps have almost no water vapor
Tropical Rain Forest 5% of the air may be water vapor.

18. Water Vapor Forms Clouds when water condenses on particles in the air
Creates Precipitation: the falling of rain, snow, sleet, or hail
Mist & Fog?
Though water vapor, they are Suspended; not precipitation.

19. Particles Real world air contains tiny solid and liquid particles of:
Dust
Smoke
Salt
Other chemicals.

20. Exit Pass
What is the significance of the 2 primary gases in the atmosphere? (Why are they important?)
What role does Water Vapor play in our atmosphere?

21. What to Work On Visit http://www.metoffice.gov.uk/learning
In the “Learning” tab, AS A GROUP, choose either “Science” (to read about weather forecasting) or “Learn About the Weather”
Let Mr. A know what topic you choose, then research it and gather the following:
A summary of your topic. What are the crucial details?
Five (5) interesting facts
Why is this topic good to know about?

22. What to Work On DUE: - Read Section 1.1 (pages 14-17) in the textbook
Answer the Section Review questions (#’s 1-4) on page 17.
DUE: -