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Each valve is broadly oval or rhomboidal, with the umbones set towards the anterior end. The posterior hinge line is straight and the posterior margin truncate. The anterior hinge line slopes slightly down towards the more steeply sloping anterior margin.
Pediment – Very gently sloping inclined bedrock surface; Pediplain – Extensive plain formed by the coalescence of pediments; Peneplain – Low-relief plain formed by protracted erosion; Planation surface – Large-scale land surface that is almost flat; Potrero – Long mesa that at one end slopes upward to higher terrain
Synonyms [2] Bela abyssorum Locard, 1897; ... at the end of the keel, and then broadly convex-sloping towards the base. The columellar edge is a little arched at the ...
In a slippery slope argument, a course of action is rejected because the slippery slope advocate believes it will lead to a chain reaction resulting in an undesirable end or ends. [1] The core of the slippery slope argument is that a specific decision under debate is likely to result in unintended consequences. The strength of such an argument ...
A triangular portion of an end wall between the edges of a sloping roof. Gablets Triangular terminations to buttresses, much in use in the Early English and Decorated periods, after which the buttresses generally terminated in pinnacles. The Early English gablets are generally plain, and very sharp in pitch.
The head of a valley may take widely differing forms; [1] for example, in highland regions the valley often ends in a broad, evenly sloping hollow. The higher the head of the valley, the more likely it is to resemble the geomorphological shape of a cirque. In glacial valleys or trough valleys, it may be referred to as the trough head or trough ...
Hip, hipped: A hipped roof is sloped in two pairs of directions (e.g. N–S and E–W) compared to the one pair of direction (e.g. N–S or E–W) for a gable roof. Cross hipped: The result of joining two or more hip roof sections together, forming a T or L shape for the simplest forms, or any number of more complex shapes.
Hip roofs have no large, flat, or slab-sided ends to catch wind and are inherently much more stable than gable roofs. However, for a hurricane region, the roof also has to be steep-sloped; at least 35 degrees from horizontal or steeper in slope is preferred. When wind flows over a shallow sloped hip roof, the roof can behave like an airplane wing.