My kids have absolutely loved this activity! It is perfect for grades 1-4. Includes a step by step lesson plan, prediction printable, observation printable, and solid or liquid graphic organizer.
If you like this activity, more are available in my Exploring Solids, Liquids and Gases Unit
Oobleck recipe,Oobleck Lesson plan, Dr. Suess, States of Matter lesson, Solids, Liquids and gases lesson plan