The document discusses the weather and atmosphere. It defines key weather concepts like air temperature, air pressure, and wind. It explains that the atmosphere is made up of different layers including the troposphere, stratosphere, mesosphere, and thermosphere. It describes how the sun heats the air and Earth's surface, causing air temperature to vary between day and night and across locations. Air pressure is defined as the pressing down force of air on Earth. Wind is moving air from high to low pressure areas. When different air masses meet, it is often cloudy, rainy, or stormy.

1. The Weather
( Objectives )
The Student be able to :
1- Understand the 3 characteristics of the weather
(air temperature – air pressure – wind).
2-Explore the layers of atmosphere.
3-Identify Air Temperature and Air Pressure.
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2. What is Air?
Air is all around you.
Air surrounds the entire Earth.
Atmosphere
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The air that surrounds Earth.
It’s made up of different gases and dust.
Some dust comes from fires and volcanoes on
Earth.

3. 3
Earth’s atmosphere is made up of layers.
Each layer has its own characteristics.

4. 4
1-Troposphere The closest layer to the surface.
All life on Earth exists here.
Where weather takes place.
In it clouds, rain, snow, and
thunderstorms occur.
2-Stratosphere The air is not still.
Very strong winds called the jet stream
are located.
3-Mesosphere Between the stratosphere and
thermosphere.
4-Thermoshere The top layer of the atmosphere.
Light displays called the northern lights
happen here.
Layers of the Atmosphere

5. What is Air Temperature?
5
Temperature Measure of how hot or cold
something is.
The sun heats the air, so it feels hot it has high
temperature.
The sun also heats Earth’s surface both the land
the water
Air temperature is always changing.
Its usually warmer during the day than at night ??
(The sun heats Earth and the air)

6. How can you measure temperature?
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You need to use a thermometer.
100 ⁰C /212 ⁰F water boils
You can make tea
30 ⁰C/86 ⁰F it’s a good day to go to beach.
10 ⁰C/50 ⁰F wear a jacket.
0 ⁰C/32 ⁰F water freezes, it’s cold.

7. 7
Does all the air around Earth get the same
amount of heat from the sun?
Places near Earth’s North and South Poles
don’t get as much sunlight as places near the
equator.
The sun stays low in the sky near the poles…so
it’s warmer near the equator than near the
poles.

8. 8
What is Air Pressure?
Air Pressure The pressing down force of the
air on Earth.
Do you feel air pressure?
Not usually ?? Your body used to air pressure, you don’t
even notice it most of time.
However ,you can notice when air pressure changes.
Ex. When you dive up mountain roads, ride an elevator, or
fly in an airplane your ears “ pop “ due to change in air
pressure pushing on your eardrum.

9. What Happens when air moves?
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Air moves from an area of high pressure to an area of
lower pressure.
Cooler air has high pressure .
The moving air is called Wind

10. 10
What happen if you pour 2 cups of water toward each
other what happen when they meet?
The water mixes even churn and bubble.
When 2 different bodies of air meet, they also mix.
Large bodies of air called
The place where different masses of air meet is where
most weather changes happen….here it may be cloudy,
rainy, or stormy.
Air masses

11. Check for understanding
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1-What makes up the atmosphere ?
2-What heats the air ?
3-What do you use to measure temperature?
4-What is air pressure ?
5-What happens when 2 different air masses
meet ?
6-What is wind?

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