1. The Water Cycle Standard 4, Objective 1
Handout 1 (4-1)
The Water Cycle
Standard 4, Objective 1

2. The origin of Earth’s water supply
What question has puzzled mankind for centuries?
The origin of Earth’s water supply

3. Up to five times as much water falls to Earth as the rivers carry off.
Once people were able to measure the amount of water that falls to Earth, what did they discover?
Up to five times as much water falls to Earth as the rivers carry off.

4. Where does all the water go?
Once people had learned how much water falls to Earth, what more puzzling question remained?
Where does all the water go?

5. What is essential for humans and all other organisms?
Water!

6. How much of Earth’s surface is covered with water?
More than two thirds

8. Where is Earth’s surface water not found?
In the atmosphere

9. flows through the rock below Earth’s surface
7. Groundwater is water that
Groundwater is water that _________.
flows through the rock below Earth’s surface

10. Water occurring as an invisible gas is called _______________.
Water Vapor

11. Where is water vapor found?
In the Atmosphere

12. It is constantly changing from one form to another.
What is always happening to Earth water?
It is constantly changing from one form to another.

13. What is the continuous movement of water from the atmosphere  to the land  to the oceans  and back?
Water Cycle

14. By what process does liquid water change into water vapor?
Evaporation!

15. What is the process by which plants and animals release water into the atmosphere?
Transpiration!