Cloud poster rubric includes the 3 main clouds + 1 student choice.
Students must follow the rubric to create 4 different clouds.
They must create one each of the three main ones
For the fourth cloud they must chose any other type of cloud
They must label and write a short description next to each cloud.
With the rubric is a pre-made grading scale for easy grading.
I had 7th graders my use cotton balls to make their cloud posters with good success. However they don't have to use them. See examples.