Sign up for our eNews - a newsletter full of ideas, images, giveaways and news about opportunities. Spam free. Signups get our FREE 'Rock of Ages' Plate Tectonics activity what has students working out the rate of movement of a tectonic plate. Occupation: Elementary Teacher Middle School Teacher High School Teacher Homeschooler 2yr Collage Faculty 4yr College Faculty College Student Museum/Outreach Other Leave this field empty if you're human: