1. Unit 8: Surface Water & The Water Cycle
Unit 8 Notes Day 1

2. The Science of the Water Cycle and Surface Water

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

4. 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

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

6. What is surface water and the water cycle?
Technically they are one and the same. The water cycle is the description of the path surface water takes as it changes form and location on the earth’s surface.

8. 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 Video

9. Water Cycle- Evaporation
The sun or heat source heats up liquid water and turns it into water vapor (gas) where it enters the atmosphere
Water vapor is invisible
Liquid  Gas
The “smoke” we see is from the vapor condensing…
Evaporation animation

10. 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.
Liquid in plants  Gas

11. Water Cycle- Condensation
Water vapor in the air gets cold and changes back into liquid drops
These drops gather together to form clouds
The average cloud weighs 1.1 million pounds
Gas  Liquid
Condensation animation

12. How Clouds Form
As the warm air rises, it cools off, and turns from water vapor to liquid water. However, the liquid water drops are so small, they are lighter than air, so they float.

13. The sun also heats up the air around the water vapor, forming a hot column of rising air called a THERMAL. The thermal helps push the water vapor up.
As the water droplets begin to condense, they give off heat that becomes trapped in the body of the cloud. The trapped heat helps the cloud rise, much like a hot air balloon.

14. Water Cycle- Precipitation
The solid or liquid water that falls from the air to the surface.
Solid  Liquid or Solid  Solid
Examples
Rain,
Snow,
Sleet
Hail
Etc.

15. Water Cycle- Runoff
Water (typically precipitation) that flows across the surface of the land and collects in rivers, streams, and eventually the ocean.

16. Water Cycle- Infiltration
The process of liquid water being absorbed into the ground and entering the groundwater system instead of traveling over the top as runoff.

18. Not all water reaches the ocean…
Bear River, UT
Caspian Sea, Russia

19. And last but not least…Tahoe flows to Pyramid, but never reaches the ocean!
Truckee

20. On the note card provided, identify all 5 points on the map by their vocab term.
Now see if kids can identify what’s happening at each number.
The Sun heats the ocean.
Ocean water evaporates and rises into the air.
The water vapor cools and condenses to become water droplets which form clouds.
When enough droplets gather, they become heavy enough to fall to Earth as precipitation.
Some water collects into the ground. The rest goes flows by rivers back to the ocean.