The document summarizes Alfred Wegner's theory of continental drift. It describes how Wegner, a German scientist, was intrigued by similarities between fossils on different continents. Through studying coastline shapes and fossil evidence, Wegner proposed that the continents were once joined together and have since drifted apart, an idea that was initially rejected by other scientists. The document outlines Wegner's evidence for continental drift and explains the three types of tectonic plate boundaries.