Learning objective =  Students learn and understand how scientists study Earth’s materials and model its layers.

Resource 1 = https://www.khanacademy.org/partner-content/amnh/earthquakes-and-volcanoes/plate-tectonics/e/quiz-plate-tectonics?authuser=0 

Resource 2 = https://contrib.pbslearningmedia.org/WGBH/arct15/SimBucket/Simulations/densitylab/content/index.html?authuser=0 

Resource 3 = https://phet.colorado.edu/sims/html/density/latest/density_all.html?authuser=0