Glad you asked...
To make a model of the water cycle, you will need to find a picture of the water cycle you can reference. You will also need to decide what type of material you want to make your model out of such as clay, felt, poster, or other material. You simply will need to use the picture of the water cycle as a guide to make your model. Here is a link to a picture of the water cycle. http://cd7.e2bn.net/e2bn/leas/c99/school...
Then again, this answer might help you...
When attempting to demonstrate processes which involve great measurements of time and space, such as the water cycle, it is best to use graphs and pictures rather than a model which traditionally denotes a 3 dimensional aspect.

