1. A water molecule is currently in a lake, where could it possibly go (in one step)

2. Water Phases
To view this animation, click “View” and then “Slide Show” on the top navigation bar.

3. Baby water cycle concept

4. The elementary water cycle:

5. Better…

6. EVEN BETTER, but still lacks time and amount information
EVEN BETTER, but still lacks time and amount information!, like 90% of clouds are from ocean evaporation!

7. What happens to rain fall? Of 100 drops of rain
2 Goes into
“ground water”
2 make it into our faucets
67 drops go back into
the sky
Within a week
30 of them go into creeks and rivers

8. But… how do those 67 drops make it back? IN TEXAS..
2 Goes into
“ground water”
2 make it into our faucets
67 drops go back into
the sky
Within a week
30 of them go into creeks and rivers

9. But… how do those 67 drops make it back? IN TEXAS..
2 Goes into
“ground water”
2 make it into our faucets
33 drops evaporate
directly
34 drops make it via
TRANSPRIATION
30 of them go into creeks and rivers

10. Atmosphere
Source: US Geological Survey

11. Pause the hydrological cycle… lets talk AMOUNT in each place.
aquifers/groundwater
atmosphere
lakes
rivers
bio

12. Million dollar question.
Are these % of where water is static? Could they change?
If you listen to news, you would know that most scientists that study it know the ocean level has risen 1-2ft in the past 50 years, and will rise several more feet in the next 50 years. What does this do to our percentages?
In the “Ice age” … how might these amounts be different?

13. Lets talk TIME for a second
How long does it STAY in each place.
This is called “residence time”
Some places you can guess have LONG residence times
Oceans, lakes, glaciers, groundwater
Some places you can then guess have SHORT residence times
Clouds, rivers, soils, animals and plants.

14. Lets talk SPECIFIC times
Reservoir
Average residence time of a water molecule
Antarctica
20,000 years
Oceans
3,200 years
Glaciers
20 to 100 years
Snow
2 to 6 months
Soil moisture
1 months
Groundwater
100 – 10,000 years
Lakes
10 to 100 years
Rivers
1 to 6 months
Atmosphere
9 days
A single cloud
40 minutes

15. Lets talk Water USES City use Drinking water Sanitation Lawn water
Car washing
Farm use
Um.. duh
Industry use
making energy.
Cooling plants
Used in the manufacturing process

16. A more fine tuned look

18. Where do we get the water we use?
Three main sources:
Rivers
Ground water
Lakes (main made reservoirs)
Sources rarely used:
Rain catchers/harvesters (mainly at homes)
Oceans – it has to be desalinated (taking salt out is expensive)
Sources never used for human needs:
Glaciers, soil water, plant and animals

19. Pair Share – I’ll call names for answers in 2 minutes.
Where is most of the water on earth? About what % of all water is there?
Of just fresh water, where is most fresh water?
Where is there more water, in the atmosphere or in all the rivers?
Where is there more water, in the ground or in all the lakes of the world?