Supplies:
Food coloring (liquid works best, not gel) in blue and green
Plate of milk (2% or whole works best)
Dish soap
Instructions:
1. Drop lots of drops of green and blue food coloring onto the milk
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2. Drop small drops of dish soap onto the food coloring and watch what happens!
3. When your finished, it will look a lot like the earth! Happy Earth day!
Why it works: Soap is a surfactant, which reduces the surface tension of the milk. This allows the colors to spread easily across the surface.
Extra credit: Ask your kids to “hypothesize” what will happen when the soap is added, and talk about their hypotheses.
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