Cinder cone

Definition and stakes

Portrait of Frederick William Rudler Frederick William Rudler,  1911 Encyclopædia Britannica (1911)

“ The shape of a cinder cone may be retained for ages, since it is not liable to suffer greatly by denudation, as the rain soaks into the loose porous mass instead of running down the outside. If lava rises in the duct of a cinder cone, it may, on accumulation in the crater, break down the wall, and thus effect its escape as a stream. Cones breached in this way are not uncommon in Auvergne. ”
Source: Wikisource

Portrait of William Herbert Hobbs William Herbert Hobbs,  Earth Features and Their Meaning

“ Toward the summit of such a cone the loose materials of which it is composed are at as steep an angle as they can lie, the so-called angle of repose of the material; whereas lower down the flatter slopes have been determined by the distribution of the cinder during its fall from the air. When one [124] makes the ascent of such a mountain, he encounters continually steeper grades, with the most difficult slope just below the crest.
Fig. 122.—A series of breached cinder cones where the place of eruption has migrated along the underlying fissure.
”
Source: Gutenberg

Portrait of Frederick William Rudler Frederick William Rudler,  1911 Encyclopædia Britannica (1911)

“ The symmetry of the hill is not infrequently affected by disturbing influences—a strong wind, for example, blowing the loose matter towards one side. The sides of a cinder cone have generally a steep slope, varying from 30° to 45°, depending on the angle of repose of the ejectamenta. Excellent examples of small scoria-cones are found among the puys of Auvergne in central France, whilst a magnificent illustration of this type of hill is furnished by Fusiyama, in Japan, which reaches an altitude of 12,000 ft. ”
Source: Wikisource

Get perspective with Kwize: daily news enlightened by great literature