4. All living things need water and air to
live.
•
It is found in three STATES
SOLID
LIQUID
GAS
Water changes state when you heat it or cool
it.
5. The three forms of water
•
You can find water in 3 different forms:
–
–
–
Liquid
Solid
Gas
Water is a liquid.
Ice is a solid at
0 degrees.
Water vapour
is a gas at
a hundred degrees
6. DOES WATER CHANGE?
•
•
•
Water turns to GAS when it is HOT.
Water turns to SOLID when it is VERY
COLD.
Water turns to liquid at ROOM
TEMPERATURE.
8. Water
•
•
•
•
•
•
We need water for drinking.
We need water for swimming.
We need water for cooking.
We need water for cleaning.
We need water for washing.
We need water for watering the
plants.
11. WATER AND LAND
•
•
•
The Earth is covered with WATER and LAND.
There is more water than land on the Earth!
We can find water is many different places. Most
of the water is salty.
12. We can find water in
•
A lake.
– A river.
– In a waterfall.
– The clouds.
– The seas.
– Groundwater.
– Reservoirs.
– The icecaps.
–
20. ALL ABOUT AIR
•
Air is a mixture of gases.
•
We cannot see air but it is all around us.
•
•
People and animals breathe oxygen from
the air.
All living things need air to live.
22. AIR IS FOUND IN THE ATMOSPHERE.
Atmosphere is the layer of gases that sorround the
Earth
23. Characteristics of air
•
•
Air is a mixture of gases, but it consists
mainly of OXYGEN and NITROGEN.
As water it has NO SMELL, NO TASTE,
AND NO COLOUR
NITROGEN
OXYGEN
24. WIND
•
•
•
•
•
•
Wind is moving air.
Hot air goes up
Cold air goes down.
The difference in temperature causes
wind.
Wind moves air from one place to another.
This is why clouds move.
25. Types of wind
•
•
•
•
No wind
Little wind
Strong wind
Very strong wind
•
•
•
•
Calm
Breeze
Gale
Hurricane
26. An anemometer measures how fast the
wind is moving.
A weather vane tells us wind direction
32. PRECIPITATION
•
•
•
•
•
Precipitation is water falling from the
atmosphere to the ground.
It can be:
LIQUID ---------RAIN DROPS
SOLID -------------- SNOW FLAKES
BALLS OF ICE --------- HAIL STONES
38. What is the water cycle?
•
The water cycle is a continuous process of
EVAPORATION, CONDENSATION,
PRECIPITATION and COLLECTION
39. The water cycle
•
•
•
•
When it is hot Water from the sea evaporates.
The water vapour condenses into tiny drops and
form clouds.
When the clouds are cold, it rains or snow.
The rain or snow falls into the sea.
47. PRECIPITATION
•
The wind moves the clouds. When the
clouds cool, water from the clouds falls as
rain. If it is very cold, the water freezes
and falls as snow. Rain and snow are both
types of precipitation.
48. COLLECTION
•
The water that falls to the ground eventually
goes into rivers. It can travel to the rivers across
the surface of the Earth or underground. Rivers
take the water back to the ocean and seas.
