2. The Water Cycle

3. Evaporation - the process in which a liquid changes to a gas.
THE SUN DRIVES THE WATER CYCLE.

4. Transpiration - Water which evaporates from the leaves in plant.
THE SUN DRIVES THE WATER CYCLE.

5. Condensation - Water vapor changing phase to a liquid.
THE SUN DRIVES THE WATER CYCLE.

6. Eureka – Condensation & Evaporation
THE SUN DRIVES THE WATER CYCLE.

7. Precipitation – Water leaving the atmosphere as rain, snow, hail, or sleet.
THE SUN DRIVES THE WATER CYCLE.

8. Runoff – water which remains on the surface.
THE SUN DRIVES THE WATER CYCLE.

9. Groundwater – an underground water reservoir.
THE SUN DRIVES THE WATER CYCLE.

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. THE WATER CYCLE: Surface Water
Surface water runs downhill due to gravity.
The area of land that contributes water to a river system is called a watershed.

14. THE WATER CYCLE: Surface Water
All of the precipitation that falls inside this area, eventually flows out this outlet into the sea.

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

16. 97% of water on the earth is in the oceans.
THE WATER CYCLE
 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.

17. DID YOU KNOW? Water Cycle Review
About ½ of 1% of the water on earth is groundwater
Only about 1/100 of 1% of the water on earth is in the rivers and lakes
A person can live about a month without food, but can live only about 1 week without water
Water Cycle Review