Materials
- Building Dams II (video)
 
Key Science Concepts
- You can stop the follow of water by building dams.
 
Directions
Before you watch: Tell children they will watch another video about children building dams—this time they build two.
After you watch: Ask,
- The girls said that Jerry’s dam is “very solid.” What do you think they meant by that? What’s Jerry’s dam like?
 - The girls played a trick on Jerry—can you explain what it was?
 - How did the children solve the problem so that everyone had enough water?
 
Optional: Show the video a second time. Ask children what else they notice this time around.

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