plate tectonicsthe theory that Earth's outer shell is divided into large plates that move and interactPlate tectonics explains why earthquakes and volcanoes occur in well-defined belts around the globe.NotePlate tectonics explains why earthquakes and volcanoes occur in well-defined belts around the globe.Elon.io is an online learning platformWe have an entire course teaching TOEFL Academic Vocabulary grammar and vocabulary.Start learning TOEFL Academic Vocabulary now