Perfect for 2nd-3rd grade science process skills review. This can be used for the end of unit review before the test or as the assessment. There are so many uses for this -- student center, cut and read around the room, or display on the board and do as a class. The best part is students (and teachers) will know right away if they are correct because the answers to each question spell out the answers to a riddle. Questions are about observing, classifying, predicting, infering, measuring, and recording data.