What feature on the physical landscape CANNOT be explained by the theory of plate tectonics?

Question

Quizplus · Accepted Answer

The theory of plate tectonics explains the movement of the Earth's lithosphere which is responsible for phenomena such as earthquakes, volcanoes, and the formation of mountain ranges and continents. The Mississippi River delta, however, is formed by sediment deposition from the river itself, not by the movements of tectonic plates.

What Feature on the Physical Landscape CANNOT Be Explained by the Theory