1. Water on Earth
The Water Cycle

2. Bell ringer: Where does the water on the outside of this glass come from?

3. Water comes from the air around the glass
Water comes from the air around the glass. The air (or gas) must lose energy to change to liquid on the outside of the glass. The ice in the glass causes the air outside the glass to lose energy.

4. Bell Ringer
When energy is added to a solid, like an ice cube, what happens?
When a gas like water vapor loses energy, what happens?

5. The Science of the Water Cycle

6. Bell Ringer
Draw a diagram of the water cycle in your science notebook

7. 3 States of Water
Solid – ice
Gas – Water Vapor
Liquid -water

8. 1. Solid
Has the least amount of energy 2. Liquid = middle or medium amount of energy 3. Gas = has the MOST amount of energy

9. Middleschoolchemistry.com
3 States of Water
Solid- atoms packed together and vibrating very slowly
Ice animation

10. Liquid Molecules loosely packed and sliding past each other
Middleschoolchemistry.com
Liquid
Molecules loosely packed and sliding past each other
Compare a solid and a liquid animation

11. Vapor (gas) Molecules are spread far apart and moving fast
Middleschoolchemistry.com
Vapor (gas)
Molecules are spread far apart and moving fast
Comparing solid, liquid, gas animation

12. How does water change state?
By adding or removing heat energy
Add energy
(think Energy In)
Remove energy
(think Energy Exits)
Heating and cooling of a solid animation
Heating and cooling of a liquid melting ice animation
Heating and cooling of a gas

13. Changing States Is energy added or removed?
Ice melting- energy is ________
Water freezing- energy is _________
Water boiling- energy is __________
Adding and removing energy

14. Scientific terms for + or - energy
Add energy= endothermic
Remove energy= exothermic

15. Where does this “energy” come from to change the state the water is in?
This process is driven by the sun and its energy

16. Water Cycle
Water Cycle Video

17. What is the Water Cycle?
The continuous movement of water into the air, onto land, and back into the air over and over again
Water Cycle

18. Water Cycle- Evaporation
The sun heats up liquid water
and turns it into water vapor (gas)
Water vapor is invisible
The “smoke” we see is from the vapor condensing…
Evaporation animation

19. Water Cycle- Transpiration
Do plants sweat?
Well, sort of.... people perspire (sweat) and plants transpire. 
Transpiration is the process by which plants lose water out of their leaves. 
Transpiration gives evaporation
a bit of a hand in getting the water
vapor back up into the air.

20. Water Cycle- Condensation
Water vapor in the air gets cold and changes back into liquid, forming clouds
Condensation animation

21. Water Cycle- Precipitation
The solid or liquid water that
Falls from the air to the surface
-rain, snow, sleet, hail…

22. Water Cycle- Runoff
Water that flows across land and collects in rivers, streams, and eventually the ocean

23. Water Cycle- Groundwater
located
within the
rocks below
the Earth’s
surface

24. Changing states in the Water Cycle
Evaporation- energy is_________
Condensation- energy is __________
Transpiration- energy is ___________

25. Water Everywhere! Water is MATTER. -What is matter?
It has Mass and Volume.

26. Conservation of Matter
Water cannot be created, nor destroyed. It cycles. It changes state (remember the 3 phases- solid, liquid, gas) it never decreases or increases in total amount.
We do not have more or less water now than we did millions of years ago!!
The Water Cycle just keeps going, and going, and going, and going……

27. More examples of Conservation of Matter
Rock cycle
Weathering/Erosion/Deposition
Plate tectonics

28. Bell Ringer The water cycle would not occur with out: a. animals
b. bacteria
c. ice caps
d. solar energy