ο κύκλος του νερού

1. THE WATER CYCLE

2. Water is used everywhere and for
almost everything – PRIVATE USE

3. …so humans have an enormous
waste of water every day!

4. - INDUSTRIAL / PUBLIC USE
Paper production
Colouring
clothes
Food production
Agriculture

5. INDUSTRIAL – PUBLIC USE

6. But where does it go and come from?

7. THE WATER CYCLE
• The water cycle describes the continuous
movement of water on, above and below
the surface of the Earth.
• The water moves by the processes of
evaporation, condensation, precipitation
and collection. Doing this the water goes
through different phases: liquid, solid (ice),
and gas (vapor).

8. 1. Evaporation
• Evaporation is when the sun heats up
water in rivers, lakes or the ocean and
turns it into vapor or steam
• The water vapor or steam leaves the river,
lake or ocean and goes into the air

9. Transpiration
• Plants put down roots into the soil to draw
water and nutrients up into the stems and
leaves.
• The other way that water gets into the air
is through transpiration, which is water
evaporation through plants. They provide
a lot of water to the water cycle.

11. 2. Condensation
• Water vapor in the air gets cold and changes
back into liquid, forming clouds. This is called
condensation.
• Condensation is the opposite of evaporation.

12. • Condensation also occurs at ground level, the
fog develops when the air that has a relatively
high humidity content comes in contact with a
colder surface, often the Earth's surface, and
cools to the dew point.

13. Sublimation
• Sublimation is a process where ice directly
converts into water vapors without
converting into liquid water.
• The main sources of water from
sublimation is the ice from the North Pole
and the South Pole.
• Is a slower process than evaporation

15. 3. Precipitation
• Precipitation occurs when so much water
has condensed that the air cannot hold it
anymore.
• The clouds get heavy and water falls back
to the earth in the form of rain, hail,
freezing rain or snow.

17. 4. Collection
• When water falls back to earth as precipitation, it
may fall back in the oceans, lakes or rivers or it
may end up on land.

18. Infiltration
• Some of the water that precipitates does
not runoff into the rivers and is absorbed
by the plants. It moves deep into the soil
and collect in the oceans, lakes or rivers
where the cycle starts all over again.
• The water goes into the ground and
increases the level of ground water. It is
called pure water and is drinkable.

20. • Water is not magically appearing or
disappearing, it is always the same
 Because of the WATER CYCLE the
water we use today is the same water that
already existed millions of years ago!
So water does not have an age!

21. How much water is on the earth?
• It's approximately 326 million cubic miles
• About 72 percent of Earth is covered in
water, but 97 percent of that is salty ocean
water and not suitable for drinking.

22. We can divide the amount of
water…

23. Who has access to clean water?

24. If all the water of the surface of the
earth would be in a bubble, it would
have this size:

25. • And all the water of the Earth compare to
all the water we can drink would look like
this…

26. We are not the only planet with
water…
• Water is present as vapor in:
The atmosphere of Mars
The atmosphere of Mercury
The atmosphere of Jupiter
The atmosphere of Saturn…
…among others!

27. THANK
YOU