The document discusses the composition of air and the water cycle. It begins by explaining that air contains water vapor and important gases like oxygen and carbon dioxide. It then goes into detail about the water cycle, describing how water evaporates into the air and condenses back into water droplets, forming clouds and precipitation in a continuous cycle. It also explains that air can contain dust particles and germs, so we should wash our hands before eating.

1. Modi Shivom
Class 5-A
D.P.S.J.

2. WHAT DOES AIR CONTAIN?
 If you take a glass of very cold water and place it on a
table, you will soon notice water drops sticking out on
the outer side of the glass. Why?
 This water didn’t leak through the glass. It came from
the air.
 Air contains water in the form of water vapor.
 Air also contains important gases like oxygen and
carbon dioxide.
 We breathe in oxygen.
 Air may also contain dust particles and germs.
 Theses can stick to our body easily. That is why we
should wash our hands before eating.

3. WATER DROPLETS

4. WATER
 Water is very important for life on earth.
 All living things need water.
 We use water for various purposes, foe example:
 Drinking cooking and watering plants.
 Ice, water, and water vapor are the three
 forms of water

5. SOURCES OF WATER
 The water from rain is called rain water.
 When snow on mountains melts, it flows into
rivers.
 This is another source of water.
 Rainwater fills puddles, ponds, lakes, rivers and
 streams.
 We build dams and canals to use river water.
 Rainwater also seeps into the ground. We can use
 this by digging wells and hand

6. DRINKING WATER
 Water from Lakes, rivers, ponds and wells may not
always be clean.
 Dirty water contains germs.
 Drinking dirty water can make us ill.
 We should boil water before drinking.
 Boiling water can kill germs.
 We should keep clean water in closed

7. SAVING WATER
 We should not waste water.
 We can save water in many ways
 We should not let the tap run when we brush our
teeth.
 We should not waste water while bathing or washing.
 If we wash many fruits, we should wash them with
water
 In a big bowl. Do not use running water.
 Rainwater can be collected in tanks, drums and
buckets. This can be used for watering plants,
cleaning cars, and cleaning floors.

8. DRINKING WATER
WATERING THE PLANTS
WATER IS USED FOR COOKING

9. Evaporation Condensation
 What happens to the water
 when wet clothes dry in the
 sun?
 The water present in the wet
 clothes changes into water
 vapor.
 What comes out of the vessel
 when water boils?
 It is steam that comes out.
 Steam is also called water
vapor.
 The change of water to water
 vapor is called evaporation.
 What happens when a steel
 plate is held on top of a hot
 vessel?
 We see tiny droplets of water
 on the plate.
 On touching the cold plate,
 the steam cools down and
 changes back into droplets of
 water.
 The change of water
 vapor to water droplets is
 called condensation.

10. WATER CYCLE
 The sun heats up the water from rivers, ponds, lakes, oceans,
 and plants. This water evaporates into the air as water vapor.
 Water vapor rises in the air. It cools down to form small water
 droplets.
 During condensation tiny water droplets mix with dust and other
 things to form clouds.
 Inside the clouds, the tiny water droplets join to form big drops.
 When water drops in the cloud become too heavy to remain in
 the air, they fall down as rain.
 In places that are very cold, the water drops freeze into ice and
 fall down as snow.
 This rain water or the snow fills the rivers, ponds, and lakes as
 this cycle continues.
 The cycle involving the change of water into water vapor
 and then to water again is called water cycle

11. Water cycle

12. WEATHER
THE GENERAL CONDITIONS OF AIR AROUND US IS CALLED W EATHER.
CHANGES IN
WEATHER ARE CAUSED BY THE SUN, WIND, AND WATER vapor IN THE AIR.
SUNNY DAYS WINDY AND CLOUDY DAYS
 Sunny days are usually
hot.
 Noon is the hottest time of
the day.
 Mornings and evenings
are cooler.
 Moving air is called wind.
 When the wind blows
slowly, it is called a breeze.
 Strong wind along with
rain or snow is called a
storm.
 Sometimes storms are
accompanied by lightning
and thunder.

13. A stormy day
A cloudy day
A sunny day

14. Seasons
 Every few months the weather changes.
 This change gives rise to different seasons.
 There are five main seasons-summer, winter,
 monsoon, autumn, and spring.
 Summer is the hottest time of the year and winter is
the coldest.
 It rains during monsoon.
 Leaves fall in autumn.
 In spring, there are flowers everywhere.
 Change in season effects the kind of clothes we
wear, the food we eat, and the activities we do Every few months the
weather changes.
 This change gives rise to different seasons.
 There are five main seasons-summer, winter,
monsoon, autumn, and spring.
 It rains during monsoon.
 Leaves fall in autumn.
 In spring, there are flowers everywhere.

15. SUMMER MONSOON
WINTER AUTUMN
SPRING