This is an easy and fun way to review the nitrogen cycle for AP Environmental Science and other advanced sciences (grades 9-12). For this formative assessment, students walk around, at their own pace, reading and answering specific questions related to the nitrogen cycle. Students record their answers on their student document which is designed as a "self check" for the student -- it is obvious when/if they mess up and signals them to determine where their misconception is (and to try again!).