Plate tectonics is the scientific theory that explains the movement and interaction of the Earth's lithosphere, or the outer layer of the planet. Some synonyms for plate tectonics include the theory of continental drift, seafloor spreading, or simply tectonics. This theory has revolutionized the field of geology and has helped explain a wide array of geological phenomena, from the formation of mountains to the occurrence of earthquakes and volcanoes. Understanding plate tectonics is crucial for predicting and mitigating natural disasters such as tsunamis and landslides, as well as for uncovering valuable mineral resources and ancient fossils.