This Plate Tectonics lesson on Seafloor Spreading focuses on the Mid-ocean ridge, Sonar, Harry Hess, Molten material, Magma stripes, Subduction and trenches.This 60-90 minute complete lesson includes: 2 warm-ups, a set of differentiated notes, a slide presentation, an activity to practice what is learned, a mini quick check assessment, essential questions and more!This product is part of my Plate Tectonics Unit Bundle, which includes:Table of ContentsStudent Score SheetPre-Assessment/Warm-upLaye