This document includes the full set of task cards for 4th grade. I have also made it so these are editable for you to use, unlike the individual sets.
-Weather & Water
-Force & motion
-Ecosystems & Adaptations
In my classroom, I have printed each set onto a different color set of cardstock. Then laminated them all and placed them into individual Ziplock bags. My students love these because they can review and quiz each other in their small groups.