Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. condition changing (processes)
6. surface or structural changes
7. warping (structural change)

Anotations

Scope note:

A type of warping usually associated with wood when one face of a length of lumber shrinks more than the other, resulting in a bowed curvature. Less commonly this process may occur in stone such as marble, due to residual stresses, anisotropic thermal expansion of calcitic grains, variation of fluid contents, and dissolution processes.