Good science class projects for kids include building model volcanoes that erupt and constructing model moon colonies or designing them on paper. Growing beans is another good science project for kids.
For the model volcano project, kids can construct a volcano out of newspaper in a cardboard box lid and decorate volcanoes with paint. They can use a mixture of baking soda and vinegar to make the volcanoes erupt.
The moon colony project, whether designed on paper or constructed as a physical model, requires kids to research what humans would need to live on the moon and what power sources they would require. The bean-growing experiment is a simple project that requires dried bean seeds, Styrofoam cups and a paper towel.