Class 3 Science Chapter 11 Air

Air is the combination of different gases on the earth like nitrogen, oxygen, carbon di oxide and some other gases. People, animals and plants need air to live. there can be no life without air. There is air all around us. Though we cannot see or touch air, we can feel it.

Air also contains smoke, dust and germs.

Smoke generated by factories, vehicles and by other means mixes with the air and makes it impure.

Breathing impure air is not good for our health. This air can make us sick. We must breathe in clean and fresh air. We should keep doors and windows open to let in fresh air. We should not cover our face when we sleep. We should play in open places.

Moving air is called breeze. When the air moves very fast it is a wind. A strong wind can blow away things like clothes, paper and loose soil.

When the wind blows the leaves of trees move. The wind dries clothes on a clothesline. The wind also carries seeds of plants to new places. This way the new plants get more space to grow. The wind makes a sailboat move on water.

Sometimes the wind blows fast and strong. Fast and strong winds can cause a storm. Storms can damage houses, crops, trees and animals.

1. People, animals and plants need air to live.
2. Air also contains water vapour, smoke, dust and germs.
3. We must breathe in clean and fresh air for good health.
4. Moving air is called breeze.
5. Fast and strong winds can cause a storm.
6. Storms cause damage to houses, crops, trees and animals.
7. A weathercock shows us the direction in which the wind blows.

1. People, animals and plants need _____ to live.
2. ______, _____ and germs make air impure.
3. When we sleep we should not _______ our face.
4. Moving air is called _______.
5. ______ and _______ winds can cause a storm.

Answers:
1. Air
2. smoke, dust
3. cover
4. wind
5. fast, strong

All the living things need air.

Air contains water vapour, smoke, dust and germs.

Moving air is called breeze.