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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
dye on top of water or oil layered over water
The idea of the Procedure (part 2) on page 5 of the Student Handout is to put a very small amount of dye on top of water or oil layered over water and observe what happens. This figure shows the setup.
I hope that helps.
Ingrid