This is a collection of 42 slides. Each slide has a discussion question that is related to a science topic studied by either 5th or 6th graders in science.
However, these questions could be used for a variety of grade levels. Topics include things like earth science (landforms, earthquakes), periodic table, sun, moon, and stars, water, weather, and more.
I would use these slides at the start of class on Tuesdays as a topical discussion and brainstorming activity.