The atmosphere is a layer of gases surrounding the Earth. It has two main layers - the troposphere, where weather occurs, and the stratosphere, the upper layer with little oxygen. The air is made up primarily of nitrogen and oxygen. Wind is moving air, and weather is defined as the state of the atmosphere at a given time and place, influenced by factors like wind, precipitation, and temperature. Precipitation includes rain, snow, sleet, and hail, which are different forms of water falling from clouds.

1. WIND
ATMOSPHERE
AIR
It´s moving air.
It´s a layer of gases
surrounding the Earth.
It´s a mixture of
different gases

2. COMPOSITION OF AIR
The air is made up of different gases:
NITROGEN
OXYGEN
CARBON DIOXIDE AND WATER
VAPOUR
It´s the most abundant gas in the air
(78%)
It´s the second most abundant gas in
the air (21%)
Living things need oxygen to breathe.

3. PROPERTIES OF AIR
AIR HAS WEIGHT.
AIR OCCUPIES SPACE.
AIR HAS NO FIXED SHAPE.

4. THE ATMOSPHERE
• The atmosphere is the layer of gases surrounding the Earth.
• The atmosphere has two parts.
TROPOSPHERE
STRATOSPHERE
It´s the lower layer.
It contains the air.
Weather happens here.
It´s the upper layer.
There is very little oxygen.
• Functions of the atmosphere
- It filters de Sun rays.
- It protects us from the Sun.
- It keeps the Earth warm.

5. Layers of the atmosphere
OZONE LAYER
7 – 17 km
50 km

6. Answer the questions:
- What is the atmosphere?
- What is the lower layer called?
- What is the upper layer called?
- In which layer does weather happen?
- What are the functions of the atmosphere?
It´s a layer of gases surrounding the Earth.
It´s called troposphere.
It´s called stratosphere.
In the troposphere.
It filters the Sun rays and keeps the Earth warm.

7. WEATHER
Weather is the state of the atmosphere at a
particular moment and place.
Wind, precipitation, and temperature
influence weather.
1.What is weather?
2. What things can influence weather?

8.  It´s a mixture of gases
 It forms the ATMOSPHERE
 Moving air is called
GENTLE WIND
STRONG WIND
VERY STRONG WIND

9. Precipitation is water falling from the clouds.
- RAIN
- SNOW
- SLEET
- HAIL
1.What is precipitation?
2. Types of precipitation:

10. LIQUID WATER
Precipitation is water falling from the clouds.
SOLID WATER AS SNOWFLAKES
MIXTURE OF RAIN AND SNOW SOLID WATER AS SMALL BALLS OF ICE

11. AIR POLLUTION
CAUSES
ARTIFICIAL NATURAL
HUMAN
ACTIVITIES
NATURAL
DISASTERS
FACTORIES
VEHICLES
VOLCANOS
EFFECTS
RESPIRATORY
ILLNESSES
DESTRUCTION
OF PLANTS
CHANGES IN
TEMPERATURE
AND CLIMATE
SOLUTIONS
USE PUBLIC
TRANSPORT
USE LESS
ELECTRICITY
RECYCLE
PROTECT
NATURE
It occurs when harmful gases, dust or smoke
are introduced into the atmosphere and make
it harmful to humans, animals and plants. This
is because the air becomes dirty.
FOREST
FIRES

12. ARTIFICIAL CAUSES OF AIR POLLUTION
Factories emit harmful gases
and smoke into the air.
Cars and other vehicles emit large
amounts of carbon dioxide.
Fertilizers and pesticides used
in agriculture releases
chemicals into the atmosphere.
Some products like insecticide
sprays contain chemicals that
pollute the air.

13. NATURAL CAUSES OF AIR POLLUTION
Pollen from plants travel in the air and
causes allergies to many people.
Volcano eruptions release hot lava,
ashes and toxic gases that pollute the
air.
Forest fires fill the air with
smoke and ashes.

15. It´s the state
of the
atmosphere at
a particular
moment and
place.
It´s solid
water falling
from clouds
as small balls
of ice
It´s an
extremely
strong
wind.
It´s water
falling from
the clouds.
It´s
moving air
Two most
abundant
gases in
the air.
The lower
layer in the
atmosphere
It´s a
gentle
wind.
Two artificial
causes of air
pollution.
It´s a
mixture of
rain and
snow.
It´s a
mixture of
rain and
snow.
It´s the
increase of
temperature
in the Earth.
It´s the upper
layer of the
atmosphere.
It´s a layer
of gases
surrounding
the Earth.