The document discusses evidence that supports the theory of plate tectonics and continental drift. It describes how early in Earth's formation, chemical segregation resulted in layers forming within the planet. Later, the nebular hypothesis proposed that planets accreted from a disk of dust and gases orbiting the sun. Evidence like matching fossil distributions, rock formations, and paleoclimate patterns across separated continents supported Alfred Wegener's idea that continents had drifted apart from an original supercontinent. This helped establish the modern theory of plate tectonics.