What type of terrain is created in dry climates by differential erosion?

• A. Plateau
• B. Upland
• C. Mesa-and-scarp
• D. Alluvial fan

Answer: (C)

The correct choice describes a terrain formed through a specific geological process that occurs in dry climates. Differential erosion happens when softer rock layers erode more quickly than harder ones, leading to a distinctive landscape characterized by steep cliffs and flat-topped hills. This process creates features known as mesas and scarps.

In this context, a mesa is a flat-topped hill with steep sides, while a scarp refers to the steep slope or cliff that separates a relatively flat area from a lower one. In dry climates, where vegetation cover is often sparse and rainfall is limited, the effects of erosion can be pronounced, resulting in the formation of these unique landforms.

Other options suggest various terrains formed under different conditions or by different processes. For example, a plateau generally encompasses a broader, high flat area often not specifically resulting from differential erosion alone. Uplands refer to elevated regions but do not convey the specificity of the erosion processes at work. An alluvial fan is a different geomorphological feature created by sediment deposition rather than erosion, typically at the base of mountains where streams spread out as they exit a canyon.

Understanding the characteristics and formation processes of these landforms helps clarify why mesas and scarps specifically arise from differential erosion in dry climates.