Testing Materials - waterproof or not?
3rd class carried out an investigation of materials to see which was the best to keep the damp out. They tested Kitchen paper, cardboard, plastic & paper.
In order to keep the test fair, the size of the material being tested was kept the same and the amount of liquid used to test each material was also kept the same.
Before testing, they predicted that plastic would be the best...and yes, they were correct!