The Theory of Plate Tectonics
The thoery of plate tectonics is a theory that explains movement of the Earth's plates, volcanic activity, continental drift, and mountain formation. The theory of plate tectonics states that Earth's outermost layer, the lithosphere, is broken into seven large hard pieces called plates. The African, North America, and South American, Eurasian, Australian, Antarctica, and pacific plates are just some of the plates. There are several other smaller plates that exist, they include the Arabian Nazca, and Philippines plates. The theory of plate tectonics began in 1915 when Alfred Wegener proposed his theory of continental drift.