Post on 19-May-2015
WATER
• Water is a liquid.
• Water has no smell, taste or colour.
• Its shape depends on
the container it is in.
UNIT 7
• Water is neccesary for life.
• People, animals and plants need water tosurvive.
• People need to drink at
least 1 litre a day.
• Many animals live in water.
Where can we find water?• In the sea, rivers and lakes.
• Underground.
• In the top of the
mountains, in the form of
snow.
• In the North and South Poles, in the form of ice.
Drinking water
• It’s safe for human drinking.
• Not all water is safe.
This is ‘non-drinking water’.
• In some parts of the world
there is very little water.
• We have to spend
less water.
• To store water
from rainfall and
rivers we use
reservoirs.
Satellyte wiew of ‘Peñarroya’ reservoir, near Socuéllamos.
• In Socuéllamos, water
we use is
underground.
We get water from wells.
The three states of water
• Water we drink is liquid water.
• Ice, snow and hailstones
are solid water.
• Water vapour
is a gas.
Water can change states
Liquid water
Solid
Gets
very
cold
SOLIDIFICATION
Ice or snow (solid)
Liquid water
gets warm
MELTING
liquid water
water
vapour
ge
tsho
t
EVAPORATION
water vapour
liquid water
CONDENSATION
gets
cold
The water cycle
• Liquid water in
the sea, rivers and
lakes evaporates
because of heat from
the Sun.
• Liquid water becomes
water vapour
1.EVAPORATION
• Water vapour rises in the air, gets cold and changes into drops of water.
• Drops of water form clouds
2. CONDENSATION
• Water from clouds
falls as rain.
• If it is very cold,
in the form of snow.
3. PRECIPITATION
• Water from rain or snow forms rivers, andlakes.
• Plants use rain
water.
• Some rain water goes
underground and into
the sea.
WATER CYCLE STARTS AGAIN