This document discusses air and water. It provides 3 key points: 1) Air is a mixture of gases including oxygen that people, animals and plants need to live. Air takes up space and moves. 2) Water can be found in nature as liquid, solid (ice), or gas (water vapor). It can also be fresh water from rivers and lakes or salt water from the sea. 3) Both air and water can become polluted, which harms living things. People must use clean water and air carefully.

1. UNIT 5
AIR AND
WATER
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2. Air
You cannot see air, but it takes up
space and it moves. Air is a mixture
of different gases. One of these
gases is oxygen. People, animals
and plants need oxygen to live.

3. Match.
It contains air.
It moves with air.

4. Which object contains air?
Glass containing
Empty glass water

5. Which object contains air?
Flat Tire
Tire

6. Which object contains air?
Deflated Balloon
Inflated Balloon

7. Remember!
Air is a mixture of different gases.
One of these gases is oxygen.

8. Water in nature
People, animals and plants need water to live.
There is water in the sea, in rivers, in lakes and in
clouds.
Sea water is salty.
You cannot drink it.
You cannot water plants with it.
There is fresh water in rivers and lakes.
You can drink it.
You can water plants with it.

9. Changes in water
The water you drink is a liquid. You have to keep it in a
container like a bottle or a glass.
If you cool water in the freezer, it changes to ice. Ice is a
solid like a rock or a pencil.
If you heat water, it changes into water vapour. Water
vapour is a gas, like oxygen.

10. Match.
It is in the sea.
It is not salty.
Fresh Water You cannot drink it.
It is in rivers.
You can drink it.
Salt Water

11. Read the sentences.
1. Ice is a solid.
2. It is hot. The ice is changing into water.
This is a liquid.
3. It is very hot. The water is changing into
water vapour. This is a gas.

12. REMEMBER!
Water is liquid, but it can change into ice. Ice is
a solid. Water also changes into water vapour.
Water vapour is a gas.

13. Water pollution
People, animals and plants need clean water. You cannot
drink polluted water. Water is polluted when people put
rubbish and chemical products into rivers and lakes. There
is not much clean water in nature. Me must use it carefully.

14. Air pollution
Air can also be polluted. Air is polluted by smoke from
factories, traffic and heating systems.

15. Cross out the bad habits.

16. REMEMBER!
We need clean water and clean air to
keep healthy.

22. DONE BY
CANDACE MIKOLA
AND
CHRISTOPHER ANGEL ALONSO