Prior to this experiment students need to learn about erosion and weathering. It would be a good idea for the students to work in pairs for the research. Then during the experiment have them draw a picture to represent what happens, if able also write their observations in complete sentences
If students struggle to get this activity there are two more to try to attempt to get them to understand how rocks break down. Not a whole lot else you can do with this activity to differentiate that I can think of, feel free to post any ideas
You could have English Language Learners work in small groups with native English speakers; students often feel more comfortable with contributing comments and asking questions in small groups.
You could address other multiple intelligences by asking students to draw the results of their experiments. There are several variations already included on the site.
Be sure to separate kids based into mixed ability groups or pairs because their could be a lot of directions for low-ability students. Plus mixing them up by ability can really help students learn from one another.