This document discusses plate tectonics and the evidence that supports the theory of continental drift. It explains that continental drift is the movement of continents across the earth's surface over geological time. It was first proposed by Alfred Wegener in 1912 and later improved by the plate tectonics theory. The document also mentions Pangaea, the supercontinent where all continents were joined together, and lists fossils, rock sequences, and mountain ranges as evidence supporting continental drift.