Sabrina illustrates the different types of landforms that exist and explains how each of them is created. The landforms she covers are: mountains, valleys, plateaus, deserts, islands, and deltas. She explains that landforms are one of the ways that nature has shaped the Earth.
Bill Nye explains plate tectonics and the origination of its theory. The areas in which the tectonics spread apart is where volcanoes form. Conversely, the areas in which the tectonics come together is where mountains form.