Adapting the "Salt Lava Lamp" Experiment for a Salt of the Earth Science Experiment, Presentation, Activity
Here is a general outline of a "science" demonstration-presentation you can make to kids, or better yet, have them learn how to do and explain it themselves so they can share it with others. Plenty to flesh out. If you use it, post your notes and pics.
Food coloring droplets (goodness, justice, etc) are dropped on top of the oil which is floating over the water (the world). Next, sprinkle some glitter (hopes, light, joy) on top of the oil. Still not working so well. What did Jesus say to add? When you add salt it really helps all these good things mix into the world and you start to see real change.
Now add the help of the Holy Spirit by adding a half-tablet of alka-seltzer.
See this YouTube video demonstration starting at the 2:03 mark. Many others like it online.