What are landforms?

Landforms refer specifically to the natural features of the Earth's surface such as mountains, valleys, plateaus, hills, and plains. These features have been shaped by various geological and environmental processes over time, including erosion, sedimentation, and tectonic activity. Understanding landforms is crucial for studying geography and environmental science, as they influence climate, ecosystems, and human activities.

The other choices describe man-made objects or structures, which do not fit the definition of landforms. For instance, structures built by people and artificial landmarks are products of human construction rather than natural occurrences. Vehicles used for transportation pertain to mobility and human activity, further distancing them from the concept of landforms. Thus, recognizing that landforms are inherently natural helps distinguish them from these other categories.