Final answer:
The statement is true; ocean basins are indeed a major landform category on Earth, encompassing a significant portion of the Earth's surface and comprising of various features shaped by tectonic processes.
Step-by-step explanation:
The statement that ocean basins are a major landform category on Earth is true. Ocean basins make up the large depressions on the Earth's surface that are filled with seawater. They are comprised of various features such as the continental shelf, abyssal plain, oceanic trench, and mid-ocean ridges. These large-scale geologic features are formed by tectonic processes, such as sea-floor spreading and plate tectonics, as indicated in Figure 1.1 which shows how different types of plate boundaries contribute to the shaping of the ocean floor.
Moreover, the importance of ocean basins can be highlighted by their vast area, covering approximately 340.1 million km², which is about 67% of the Earth's total surface. This is considerably larger than the land's share of approximately 170.3 million km² or 33%. These figures underscore the significance of ocean basins as one of the main types of Earth's topographic regions, alongside other landforms such as mountains, plains, and islands as described by WG.4B.