EVS 3_ CH 8 (Air and Water) Part 1

​Chapter 8

​by: Ms. Angelita

​Learning Objectives

• ​Discuss what is air

• ​Identify composition of the air

• ​Discuss the importance of air.

• ​

​What is air?

​What is AIR?

​-Air is a mixture of many gases.

• Air is present around us.

• We can't see air, but we can feel it when it moves.​

​

​What is a moving air called?

​

​What is a moving air called?

​

​A moving air is called wind.

​Atmosphere

​The earth is surrounded by a thick layer of air called the atmosphere.

Multiple Choice

1. Air is a mixture of many gases.

• A. true

• B. false

Multiple Choice

2. We can see air and feel it.

• A. true

• B. false

Multiple Choice

3. Air is present around us

• A. true

• B. false

Multiple Choice

4. A moving air is called _______

• A. wind

• B. storm

Multiple Choice

5. The earth is surrounded by a thick layer of air is called the _____

• A. atmosphere

• B. oxygen

What are the components of air?

What are the components of air?

​

​

​-Air is a mixture of gases such as;

​

All living things need oxygen to live. Carbon dioxide is used by plants to prepare food.

​Air also contains water vapour.

​

​DUST IN THE AIR

​Touch an object at home or in school that has not been wiped for many days. You will find a layer of dust on it. Where does the dust come from?

​

​

​

​

​ It comes from the air.

Multiple Choice

6. Air contain different mixture of gases

• A. true

• B. false

Multiple Choice

7. Air contains 78 % oxygen

• A. true

• B. false

Multiple Choice

8. Dust comes from air.

• A. true

• B. false

Multiple Choice

9. A water vapor is gas that will turn into water.

• A. true

• B. false

Multiple Choice

10. What are the gases present in air?

• a. nitrogen

• b. carbon dioxide

• c. oxygen

• d. all of these

Multiple Choice

11. Oxygen is needed by all living things to survive like human, plants and animals.

• A. true

• B. false

Multiple Choice

12. A _______ is needed for the plants to make their own food.

• A. Carbon dioxide

• B. Oxygen

Multiple Choice

13. Other gases has 1% in the air composition.

• true

• false

​Why we need Air?

​

​All living beings need air to survive.

Human beings and animals

​-Human beings and animals need oxygen for breathing. They cannot survive without air as well as plants do to convert food to energy.

​While climbing on the mountains,

​**mountaineers always carry oxygen cylinders for breathing. This is because air becomes thinner as they climb up.

Multiple Choice

14. Which of the following below needs air?

• a. human being

• b. animals

• c. plants

• d. all of these

Multiple Choice

15. The mountaineer, bring always an oxygen cylinder  while climbing the mountain.

• A. true

• B. false

Multiple Choice

16. Plants need oxygen to make their own food

• A. true

• B. false