This presentation is the story of seafloor spreading, from the viewpoint of Harry Hess. There is no prep, you can download this and present it the same day! Also comes with guided notes for those students who would benefit from them. There is enough information in the slides for you to present to students even if you are not strong in the content area. Editable in PowerPoint or can be uploaded to Google Drive.
Meets NGSS standards MS-ESS2-1 and HS-ESS2-3.