The theory of plate tectonics is supported by several types of evidence. Key pieces include the fitting shapes of continental coastlines, fossil evidence found on different continents, and patterns of earthquakes and volcanic activity that align with tectonic plate boundaries. Additionally, paleomagnetism shows symmetrical patterns of magnetic minerals in oceanic crust, indicating seafloor spreading. This convergence of evidence from geology, paleontology, and seismology together substantiates the dynamic nature of the Earth's crust and the movement of its plates.