1. The Water Cycle

2. THE SUN DRIVES THE WATER CYCLE.

3. The Water Cycle THE SUN DRIVES THE WATER CYCLE.

4. The Water Cycle THE SUN DRIVES THE WATER CYCLE.

5. The Water Cycle THE SUN DRIVES THE WATER CYCLE.

7.  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. Evaporation

8.  Water vapor in the air gets cold and changes back into liquid, forming clouds. This is called condensation.  You can see this at home when you take a shower and the windows and mirrors in the bathroom fog up. You can also do this by breathing on a mirror. Condensation

9.  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. When it ends up on land, it will either soak into the earth (infiltration) and becomes part of the “ground water” that plants and animals use to drink or it may run over the soil and collect in the oceans, lakes or rivers where the cycle starts all over again. Accumulation

10. Why Study Water? Only 3% of Earth’s water is freshwater. Only 30% of ALL freshwater is in liquid form: 1% on the surface 29% underground

11. THE WATER CYCLE  GLACIERS  Snow falls onto mountains and stays a long time (10s of 1,000s of years).  When it finally melts, it provides water for streams and rivers.

12. THE WATER CYCLE: Surface Water Surface water comes from precipitation and moves due to gravity.

13. Surface water runs downhill due to gravity. The area of land that contributes water to a river system is called a watershed.

14. All of the precipitation that falls inside this area, eventually flows out this outlet into the sea.

15. Some surface water eventually becomes GROUNDWATER Some surface water eventually becomes GROUNDWATER

16. Groundwater – water that soaks (infiltrates/percolates) into the ground from rain or melted snow. Groundwater – water that soaks (infiltrates/percolates) into the ground from rain or melted snow.

17. Layer of permeable rock or sediment. GROUND WATER

18. Ground Water Aquifer – Layer of permeable rock or sediment. Notice the RECHARGE ZONE

19. Ground Water Aquifer – Layer of permeable rock or sediment. Aquifers are “recharged” by precipitation filtering into permeable soils.

20. Aquifers provide water for wells.

21. THE WATER CYCLE  Oceans: where it all ends up going.  Oceans: where it all ends up going.  Rivers, streams and runoff carry all of the water AND EVERYTHING ELSE from the land into the oceans. When water gets into the oceans, it mixes and becomes salty.  97% of water on the earth is in the oceans.

22. DID YOU KNOW? AAAAbout ½ of 1% of the water on earth is groundwater OOOOnly about 1/100 of 1% of the water on earth is in the rivers and lakes IIIIt takes 39,090 gallons of water to make a new car, including tires OOOOver 17,000,000 houses use private wells for their drinking water supply AAAA person can live about a month without food, but can live only about 1 week without water