how do we use air & water
TRANSCRIPT
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How do we use air & water?
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Water is an important resource. People use water for drinking, farming &
cooking.
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People also swim, fish & play in water too.
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Can we drink from the water which we swim in?
- Of course not, because they are different types of water.
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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
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It’s found in rivers, ponds, lakes & streams.
Fresh water resources
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Glaciers, Ice bergs & Sea ice are also examples of fresh water although this water is frozen.
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Also “ground water” water that is held in rocks below the ground is a kind of fresh water.
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This kind of water is not used for drinking.Most of the earth’s water is salty water like:
Oceans & Seas.
Salt water resources
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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
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How do people get water?
Aqueducts Reservoirs Wells
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They are pipes that carry water to where it is needed.
Aqueducts
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In some places, people build a wall “Dam” across a river & water gathers behind it.
Reservoirs
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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
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Do you think we can drink water directly from the river?
Of course not, As this water is not clean yet
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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
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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
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Step (2):
Water move to layers of sand & gravel, these layers trap
mud & tiny things
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Step (3):
Then chemicals are added to kill any harmful things in the
water
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Step (4):
Clean water is then pumped to people
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Good / Bad
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- Water pollution happens when harmful things get into water.
- Pollution makes living things sick.
Water pollution
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Types of pollution
Natural pollutionMan – made
pollution
Happens naturallyHappens because
of people
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- Rain washes pollutants “like: dust” from air & land into the
water.
Natural pollution
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- People use fertilizers to help plants to grow.
- These fertilizers soak into the ground & pollute ground water.
Man-made pollution
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Conserving resources is to use resources wisely, so they can last for a longer time.
Conserving resources
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Ride your bicycle instead of the car whenever you can.
This can conserve fossil fuels
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Turn down the heater & wear a sweater, if it’s cold.
This can conserve fossil fuels
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Turn off the lights when leaving a room.
This can conserve fossil fuels
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Turn off the water tap while brushing your teeth.
This can conserve water
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Plant trees & other plants.
This can protect the soil & helps put oxygen back to the air
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This can protect land & water
Dispose your trash & chemicals properly.