hooglaag

Hooglaag is a Dutch term that literally combines hoog (high) and laag (layer) and is used in various Dutch-language contexts to refer to an upper part of a layered system. The precise meaning depends on the discipline, but the common idea is that it denotes the uppermost or an elevated layer relative to deeper layers.

In geology and soil science, hooglaag often describes the uppermost soil horizon or the top portion of a stratigraphic sequence closest to the surface. This layer is typically most affected by weathering, moisture, plant roots, and biological activity. It is commonly contrasted with the onderlaag (lower layer) and with deeper subsoil or bedrock. The concept helps researchers discuss surface processes such as erosion, horizon development, and contamination.

In construction and materials science, hooglaag may appear as a practical descriptor for the upper layer of a layered material or composite. In professional Dutch usage, more precise terms such as bovenlaag, toplaag, or bovenste laag are usually preferred to avoid ambiguity.

In meteorology or atmospheric sciences, standard Dutch terminology uses names for specific atmospheric layers (for example troposfeer and stratosfeer). Hooglaag is not a formal technical term in that field, though it may occur in informal or pedagogical discussions to refer to upper atmospheric regions.

Etymology: the word is a straightforward combination of hoog and laag, reflecting its role as the upper layer within a system. See also laag, bovenlaag, stratigraphy, soil profile.