We did this lesson a couple months ago. The kids loved it and STILL talk about it. I could see these lessons used for Children's Church or youth group devotionals, and even ladies meeting devotionals! Object lessons always seem to work well with all ages!
The verse we used in this lesson is
Matthew 28:19-20 -Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you always, even unto the end of the world. Amen.
We talked about our job as God's church and how we are to go into ALL the world and teach others all that Jesus taught.
Then we did the Science experiment!
I had enough water bottles for each student to have one of their own. A funnel, oil, food color, Alka-Seltzer, and water .
Fill the water bottle with 2-3 inches of water
Using the funnel have students add oil, leaving 2 or so inches at the top.
Have students choose a color and add 3-4 drops (this can take a few mins for the color to float down and color the water)
The water represents the church, the oil is the world. They are separate. But out job is to "go into all the world"
Break apart a Alka Seltzer tablet, and have the students put them in their bottle (leaving the bottle UN capped the whole time)
When the tablet reaches the water at the bottom, the magic begins! The water begins to go up and down all through the oil. Just as we are to go into the world with the gospel!
These are like Lava Lamps! My kids had fun shining flashlights through the bottom of the bottles. The great thing is that when the bubbles stop you can put the lid on, send some tablets home with the students and their bottles and they can do this fun activity over and over.