1. The Water Cycle

2. Where has your
water been?

3. Water on Earth There is a finite amount of water on Earth.
It covers 75% of the Earth.

4. Water on Earth
Water constantly changes phases and locations on the planet:
solid, liquid, or gas

5. Water on Earth
Water is not evenly distributed, and most is unsuitable for drinking.

6. Saltwater
NOT fit for consumption.
Oceans are salty because of minerals like halite.
Salt is not evaporated by the sun.

7. Freshwater 2.15% is frozen in ice caps and glaciers
This is the majority of our freshwater
.65% is freshwater in lakes, streams, groundwater, and water vapor in the air

8. Freshwater
We use less than 1% (<1%) for drinking and personal hygiene
We need it for agriculture, fisheries, transportation, heating and cooling, manufacturing, and many other purposes.

9. Freshwater We must conserve water WE NEED WATER TO SURVIVE!!!!
Can be depleted or polluted, and unavailable or unsuitable for human life
WE NEED WATER TO SURVIVE!!!!

10. Pollution
Point source pollution- pollution that comes from one specific site
Non-point source pollution- pollution that comes from many sources

11. Pollution Sources
Point Source
Pollution
Non-point Source
Pollution

12. Estuary
An area where a river meets the ocean, bringing in minerals from runoff
Contains brackish water
Many animals lay eggs here because of low salinity.

13. Salinity
Salinity is the measure of how much salt is in solution.

14. Desalination
The process of removing salt from water.

15. Groundwater
Found in innumerable holes, pores, fractures, and cavities in bodies of water
Most municipal and industrial water comes from the ground.

16. The Water Cycle
The water cycle continuously moves water through the atmosphere, land, and oceans.

17. 3 Processes in the
Water Cycle
Evaporation
Condensation
Precipitation

18. Processes in the Water Cycle
Evaporation- to change from a liquid to a gas by adding heat
Water in its gaseous phase is called vapor.

19. Processes in the Water Cycle
Transpiration- a special type of evaporation that occurs when water is released through the leaves of plants

21. Processes in the Water Cycle
Condensation- to change from a gas to a liquid by removing heat
Clouds (made of water droplets) are formed by condensation

22. Processes in the Water Cycle
Precipitation- water that falls to Earth’s surface in the form of rain, sleet, snow, or hail

23. Solar Radiation

24. Water Cycle Songs http://youtu.be/iEsOAaqshiM