Here is a resource with a descriptive approach to explaining the scientific method. It's simple, but effective for both introduction and reinforcement of this concept. 

Ninth graders learn about the effect pollution has on water and how this affects their community. In this environmental awareness instructional activity, 9th graders expand their vocabulary and create a flowchart that...

Students review basics of subject and verb agreement, and write sentences in which the subject and verb are in agreement.