Hello kids from Ireland.
If you put some color to the water , water will became colored, of course. The things who do not sink, stays on a surface of the water, you can observe melting, mixing, turbulence...
2. it is really easy to do, try it.
3. Not long. First we all have to bring plastic bottles to the preschool. Than we start to collect things and choose colours, we just try to put in a water in a bottle as many things as we can remember. Easy, isn t it?