The link below will take you to the plate tectonics portion of the Annenberg Lerner website. This website is a fantastic teacher resource for professional development and for teaching material (not just for Earth science). The site is interactive and includes videos/animations of different earth science processes. This link would most likely be used by a teacher for preparing a lesson on plate tectonics, rather than having students explore it themselves. With that said, there are portions of the site that upper intermediate students would likely enjoy exploring.