Flowcharts create a clear visual explanation in a variety of situations. Give a set of instructions to your students. Have students describe a chain-of-events or a key decision. Elaborate on a process.
Chrome Web Store (the first module in the Google Apps training, by the way) includes so many powerful tools for you and your students. LucidChart allows to easily create and share a variety of diagrams quickly. The tools are click-and-drag intuitive, and it's loaded with options. Great for flowcharts, it also builds other diagrams, mind maps, etc.
Like many of the apps you'll find in the Chrome Web Store, LucidChart integrates with your Google Drive, allowing you to easily save your diagrams in with all your other docs, presentations, and other files.