Which of the following is considered a natural contributor to landscape formation through erosion?

Geological erosion is indeed a natural process that significantly contributes to landscape formation. This process involves the wearing away and movement of rocks and soil by natural forces such as water, wind, and ice over geological time scales. Geological erosion shapes the terrain and forms features like valleys, mountains, and cliffs, playing a crucial role in the development of the Earth's surface.

The other options, while they may influence erosion, are primarily the result of human activities or altered natural processes. Soil compaction disrupts natural soil structure and can lead to increased runoff and erosion but is not a natural contributor. Land cultivation alters the landscape for agricultural purposes and often leads to increased erosion due to the removal of vegetation. Urban development changes the landscape through construction and impervious surfaces, leading to altered water flow and increased erosion risk.