väliskihid
Väliskihid, often translated as "outer layers" or "external strata," refers to the outermost structural components of a system or object. In geology, väliskihid can denote the uppermost layers of the Earth's crust, encompassing soil, regolith, and sedimentary rocks that lie above the bedrock. These layers are subject to weathering, erosion, and the processes that form soil.
In biology, the term might describe the external coverings of an organism. For example, in plants, the
Within engineering and materials science, väliskihid are the external surfaces or coatings applied to a material