arrée

Arrée is a term used in geology to describe a type of rock formation characterized by a series of parallel, steep-sided ridges or hills. These formations are typically found in areas where sedimentary rocks have been eroded by wind, water, or ice. The term "arrée" is derived from the French word for "ridge" or "crest."

The formation of arrées is often associated with the erosion of layered sedimentary rocks, such as sandstone or limestone. As the softer layers are eroded away, the harder layers are left standing, creating the characteristic ridged appearance. The ridges can vary in size and spacing, depending on the type of rock, the intensity of erosion, and the climate.

Arrées are commonly found in desert regions, where wind erosion is prevalent, but they can also be found in other environments where erosion processes are active. In some cases, arrées can be quite large, stretching for several kilometers and rising hundreds of meters above the surrounding terrain.

The study of arrées can provide valuable insights into the geological history of an area, as well as the processes that have shaped its landscape over time. By examining the size, shape, and orientation of the ridges, geologists can infer the type of erosion that occurred and the direction of the prevailing winds or water currents.