2nd Standard: Air and Water (Environmental Science, EVS)

Air
Air is one of the natural resource from the environment.
No one can see or touch air but it is always around us.
Humans, Animals and Plants need Air to breath.
When Air moves it is called as Wind. We feel air only
when it moves.
Wind is classified based on it’s speeds. Sometimes it can
be gentle or strong also.

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Breeze: A gentle Wind
Gently or slowly moving air is called as Breeze.
We feel very pleasant with the breezing air.


Gale: Strong Wind
Wind blowing fast and slightly strong is called as Gale.
It can move the leaves and branches of tress.


Storm: Very Strong Wind
Very strong wind with rain or snow, is called as Storm.


Hurricane: Very severe Storm


Effects of Storm

Uprooted Tree

Washed away farms

Flooded Land

Destroyed Houses


Use of Wind
Wind helps to move the sail boat.
Wind moves the fan of the windmill

Sail Boat

Windmill


On windy day kids can fly Kites.
Wet clothes dry fast in windy air

Flying kite

Drying clothes


Forms of
water
Cleaning
Of water

Fresh
water
Water

Things
mix or
doesn’t
mix

Salt
water
Uses of
water


Water
Water is one of the natural resource.
Humans, Animals and plants need water to drink and
live.
Water has no fixed shape.

Water covers 71% of the Earth’s surface.


Form of Water – Solid
Ice is the solid form of water.
When water temperature is very low then it freezes and Ice is
formed.

Ice

Frozen seawater


Form of Water - Liquid
Liquid form of water is Water.

Water

Water


Form of water - Gas
Steam or Water vapor is the gas form of water.
Water is converted into steam when heated.
Cloud are formed by water vapor.

Water Vapor or Steam

Clouds


Saltwater
Saltwater contains high amount of salt.
It covers major part of Earth.

Sea / Ocean

Lagoon


Fresh water
Fresh water has low concentration of dissolved salts.
It can be used for drinking.
It covers a very small part of earth. (less than 2%)

Lake

River


Sources of Fresh Water

Pond

Ground water

Glacier

Spring


Fresh water at Home

Hand pump

Well

Water Tap

Water Can


Uses of Water

For Drinking

In Industries

For Agriculture

Transportation


Uses of Water at Home

Cooking

Cleaning

Bathing

Toilets


More uses of Water at Home

Watering Plants

Washing Clothes

Car wash

Washing Vegetables


Water: Fun Activities

Swimming

Water Parks

Rafting

Boat Racing


Water Attributes
Water is a universal solvent because many things can be mixed in water
Things which doesn’t dissolve in water are Oil, Stones, etc.

Things
Mix In
Water
Sugar

Salt

Color

Lemon

Sand

Wax

Oil

Stones

Things
Does not
mix in
water


Clean water and Dirty water
The water that is used to drink should be clean.
Dirty water has germs that can make us fall sick.

Dirty water

Clean water


Water Purification at Home
Boiling kills all types of germs.
Water filters removed various types of impurities from water.

Boiling

Water filter


Water Storage at Home
After boiling or filtering, store the clean water in closed and clean
containers.
Prevent it from getting dirty.

Water storage

Water storage


Glossary:
Dissolve - To Mix
Germs - Small living things that can make us sick
Purify - To Clean
Solvent

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2nd Standard: Air and Water (Environmental Science, EVS)

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2nd Standard: Air and Water (Environmental Science, EVS)