The Earth's uppermost layer is made up of tectonic plates. The primary tectonic plates are shown on the map below. Image courtesy of the USGS At the boundaries of tectonic plates, rock materials A. are brought to Earth's surface from its interior and to Earth's interior from its surface. B. cannot be found due to the process of melting. C. are only brought to Earth's interior from the surface. D. are brought to Earth's surface through the process of erosion.