This website gives some sample pages from the book, 50 Debate Prompts for Kids. I liked this because the book first teaches the basic guidelines and reasoning for debates, then equips the teacher with potential topics and how to teach them. This would be useful in any grade classroom because you can adapt the ideas for the different levels, but the objectives for debates stay the same.
Starting Point -- Teaching Entry Level Geoscience. Learn about instructional methods that work with entry-level geoscience students. This site is designed for faculty and graduate students teaching undergraduate entry-level geoscience, environmental science, or related courses. Each section describes a teaching method, why/when it is useful, how it can be implemented, and a set of examples spanning the Earth system that can be used in your class.
Classroom Debate Outline: How to organize a friendly class debate on ANY topic
This outline is designed to help teachers organize effective inquiry-based classroom debates. The documents within this file gives students a step-by-step outline of what they need to include in their debate, what they need to say, and when they need to say it!This activity can be completed in any subject area that requires a comprehensive review into a particular topic.