How do we use air & water

How do we use air & water?

Water is an important resource. People use water for drinking, farming &

cooking.

People also swim, fish & play in water too.

Can we drink from the water which we swim in?

- Of course not, because they are different types of water.

We have two types of water resources:

1) Fresh water resources: The type of

water used for drinking.

2) Salt water resources: The type of

water which is not used for drinking.

Water resources

It’s found in rivers, ponds, lakes & streams.

Fresh water resources

Glaciers, Ice bergs & Sea ice are also examples of fresh water although this water is frozen.

Also “ground water” water that is held in rocks below the ground is a kind of fresh water.

This kind of water is not used for drinking.Most of the earth’s water is salty water like:

Oceans & Seas.

Salt water resources

Mum, How do we get the water we

drink from the rivers to our

home?

Well, water gets to us

through many ways, let’s see

How do people get water?

Aqueducts Reservoirs Wells

They are pipes that carry water to where it is needed.

Aqueducts

In some places, people build a wall “Dam” across a river & water gathers behind it.

Reservoirs

They are deep holes that people dig to reach the underground water.

These wells are filled with the underground water & then we pump it out.

Wells

Do you think we can drink water directly from the river?

Of course not, As this water is not clean yet

Treating water

To treat water, is to make water safe & clean for people to drink

Water from rivers & lakes may contain very harmful materials, that’s why we have to clean water &

treat it first before we drink it

Step (1):

Water sit still in a tank, so heavy things in the water fall

in the bottom of the tank.

Steps of treating water

Step (2):

Water move to layers of sand & gravel, these layers trap

mud & tiny things

Step (3):

Then chemicals are added to kill any harmful things in the

water

Step (4):

Clean water is then pumped to people

Good / Bad

- Water pollution happens when harmful things get into water.

- Pollution makes living things sick.

Water pollution

Types of pollution

Natural pollutionMan – made

pollution

Happens naturallyHappens because

of people

- Rain washes pollutants “like: dust” from air & land into the

water.

Natural pollution

- People use fertilizers to help plants to grow.

- These fertilizers soak into the ground & pollute ground water.

Man-made pollution

Conserving resources is to use resources wisely, so they can last for a longer time.

Conserving resources

Ride your bicycle instead of the car whenever you can.

This can conserve fossil fuels

Turn down the heater & wear a sweater, if it’s cold.

This can conserve fossil fuels

Turn off the lights when leaving a room.

This can conserve fossil fuels

Turn off the water tap while brushing your teeth.

This can conserve water

Plant trees & other plants.

This can protect the soil & helps put oxygen back to the air

This can protect land & water

Dispose your trash & chemicals properly.