Condensation, Precipitation, and Evaporation THE WATER CYCLE Day 1 Condensation, Precipitation, and Evaporation Teacher Notes: This slide show and accompanying activities are the Day 1 lesson on the water cycle. This lesson is designed to fill between 30 and 40 minutes.

INDICATORS Recognize and describe that the amount of water on Earth continues to stay the same even though it may change from one form to another. Describe how water on Earth changes. Condensation Precipitation Evaporation Teacher Notes: Take the time to “make it messy”. Review the vocabulary of the indicator with students prior to the lesson, throughout the lesson, and even again at the end of the lesson.

What do you know? Answer True/False questions 1 – 9 to see what you already know about the water cycle. Teacher Notes: Let students explore their ideas about the water cycle during this pre-assessment. The assessment will be given again at the end of the Day 1 lesson, at which time you can discuss the actual answer with the students.

The water on Earth is about 3 billion years old. There is no new water. The amount of water on Earth changes each year as people use it. Only heat from the Sun causes water to evaporate.

4. Examples of precipitation are snow, hail, and sleet. 5. Examples of condensation are rivers, oceans, and streams. 6. Water cannot evaporate unless it is boiling.

7. Today, you and I drink recycled water. 8. The condensation that forms on a cold, frosty glass comes from the air. 9. Some living things can survive without water. 10. The water cycle stops at night.

Let’s look at a model of the water cycle. Teacher Notes on making a class model: Materials: -(1) Cordless Jug Kettle from Rocks, Erosion and Weathering Kit -(1) Tray, clear plastic from Rocks, Erosion and Weathering Kit -(1) Zip-Loc baggie of ice Optional Model: You could use the water cycle model from old 3rd grade Water Planet unit if you school has one. (To use this model add ice under the cloud on the lid, and add several inches of warm water to the bottom of the container. Set the model aside as you move on to another section of the lesson, and then come back to view evidence of the water cycle later. 15-20 minutes) Procedure: Put 2 inches of water into the kettle. (Filling the kettle completely will cause boiling water to shoot out.) Turn on the kettle to boil the water. (The kettle has an automatic shut-off, so you will need to continue depressing the button to produce steam.) Explain that the steam we see is EVAPORATION, where the liquid water has changed to water vapor (gas). Have a student examine the clear plastic tray to prove that there ar e no holes or other way for the ice to melt through the container. Place the baggie of ice into the clear plastic tray. Hold the tray with ice over the kettle as steam continues to escape. (Remember to continuously hold the button down. Position yourself so as not to be burned by the steam.) After CONDENSATION occurs on the bottom of the clear plastic tray, lift the tray to show students the proof of CONDENSATION. Explain that CONDENSATION is the water vapor (gas) returning to the liquid form. Also show students the baggie of ice and that the ice has melted within the baggie. Continue to hold the tray with ice over the steam until larger water droplets appear and begin to fall off of the container. Explain that this is PRECIPITATION, or the falling of water back to our model of Earth. OPTIONAL: Let another student examine the container to see that there are no holes in the container or baggie. Review the water cycle that was modeled. Teacher instructions are located on this slide in “Notes View” of Powerpoint

LESSON REVIEW Take the TRUE/FALSE quiz again. Did you change any answers? Why? Teacher Notes: Students could complete this review orally, or using paper and pencil for a graded assignment.

The amount of water on Earth changes each year as people use it. The water on Earth is about 3 billion years old. There is no new water. The amount of water on Earth changes each year as people use it. Only heat from the Sun causes water to evaporate. Teacher Notes: True False

4. Examples of precipitation are snow, hail, and sleet. 5. Examples of condensation are rivers, oceans, and streams. 6. Water cannot evaporate unless it is boiling. Teacher Notes: 4. True 5. False 6. False

7. Today, you and I drink recycled water. 8. The condensation that forms on a cold, frosty glass comes from the air. 9. Some living things can survive without water. 10. The water cycle stops at night. Teacher Notes: 7. True 8. True 9. False 10. False

ACTIVITY Work with a partner or small group to draw and label your own water cycle diagram. Use ScienceSaurus page 188-189 to help you write a definition of each step. Teacher Notes: Students might read this selection first using Reciprocal Teaching strategies or some form of note taking. Then have students work to create a diagram or poster to show their understanding of the process.

Condensation, Precipitation, and Evaporation THE WATER CYCLE Day 2 Condensation, Precipitation, and Evaporation Teacher Notes: This slide show and accompanying activities are the Day 1 lesson on the water cycle. This lesson is designed to fill between 30 and 40 minutes.

INDICATORS Recognize and describe that the amount of water on Earth continues to stay the same even though it may change from one form to another. Describe how water on Earth changes. Condensation Precipitation Evaporation Teacher Notes: If you made this slide “messy” on DAY 1, you may wish to go back to the original slide to review your thinking from that day.

Now that we have seen the water cycle in action, let’s take a closer look at each step.

EVAPORATION The process of changing water from a liquid to a gas. Water vapor is the name for water in gas form. Heat from the sun causes water on the Earth’s surface to evaporate more rapidly.

EVAPORATION

EVAPORATION Click on the black screen to begin the 2 minute video.

CONDENSATION The process of changing water from a gas to a liquid. This happens when the air gets cooler. Water droplets clump together to form a cloud.

CONDENSATION

PRECIPITATION Water that falls to the Earth’s surface as: Rain Snow Sleet Hail Precipitation occurs when the water droplets become too large and heavy for the cloud.

PRECIPITATION

PRECIPITATION

THE WATER CYCLE The change of water from liquid to gas and back to liquid as it moves between the Earth’s surface and atmosphere. The combination of evaporation, condensation, and precipitation occurring in a repeated cycle is called the WATER CYCLE. The water cycle is always occurring.

THE WATER CYCLE Precipitation Condensation Water Vapor Evaporation

WATER CYCLE ACTIVITY Read a short poem on the Water Cycle on the following slide. After your teacher gives you a copy of the poem, circle the science words that you find. Finally, illustrate each stanza. See journal for copy of poem and independent assessment page.

THE WATER CYCLE by W. Gregory Stewart           When the sun is shining      On the water in a pond,      And the water's getting warmer,      Then the water will respond By turning into vapor!      (First it's liquid, then it's gas.)      This is called EVAPORATION--      But you know that, don't you, class?       So the water vapor rises      Up to where the air is cold,      Which causes CONDENSATION      Into all the clouds that hold...             JACK AND JILL July/Aug. 1999, pp. 15-18 From JACK AND JILL, copyright (c) 1999 by Children's Better Health Institute, Benjamin Franklin Literary & Medical Society, Inc., Indianapolis, IN. Used by permission.

...that evaporated water. When the clouds can hold no more,      They let the water out and then      The rain begins to pour,       Or snow, or sleet, or hail,      Or any combination.      And what's the name for this?      Of course--It's called PRECIPITATION. And that's the WATER CYCLE,      Just as plain as one, two, three--      Let's try the rhyme just one more time,      Come, say the names with me: Step one's EVAPORATION;      CONDENSATION'S number two;      Step three's PRECIPITATION--      When the water falls on you! Teacher Notes: After students have completed the activity, go back and share their illustrations along with the science words that they circled.

THE END Teacher Notes: You may also wish to explore the website; http://ga.water.usgs.gov/edu/watercycle.html