One easy way to use Presentations in Drive, no matter your content area, is to create Vocabulary Sets. You as the teacher can give the students vocabulary words for the week. Then, the students will create a presentation, with one word per slide, and then fill up the presentation with definitions, drawings, images, whatever they need to help remember the word, and voila! Instant study guide! This can easily be shared among students, and with the teacher for future grading.
This technique can also be used when giving students topics for a Test Review. Simply outline the topics for them, and they create a presentation, including and uploading their class notes, images, drawings, etc to share among themselves, and facilitate study groups.