This document discusses plate tectonics and continental drift. It explains that Alfred Wegener first proposed that continents were once joined together in a supercontinent called Pangaea before drifting apart. This theory of continental drift involves the slow movement of tectonic plates over time. The document provides evidence for continental drift, including matching fossil records, continental shapes, and rock patterns found on separated continents. It also notes that the study of tectonic plates is called plate tectonics.