The unit begins with students observing and commenting on a layered column of different colored liquids.
(The unit; begins; with students observing and commenting on a layered column of different colored liquids) (students; observing; ) (students; commenting; on a layered column of different colored liquids)
The unit students students
begins observing commenting
with students observing and commenting on a layered column of different colored liquids
on a layered column of different colored liquids