9. How do we know that tectonic plates move?
Plate tectonics is a scientific theory that describes the large-scale motions of Earth's lithosphere. The theory builds on the concepts of continental drift, developed during the first decades of the 20th century. [ It was accepted by the geoscientific community after the concepts of seafloor spreading were developed in the late 1950s and early 1960s. ]
There are no new answers.