. Elementary physical geography . Fig. — a Japanese volcano. 235). The same is true of Vesuvius, and a part of the oldrim which formed Monte Somma was blown away ; andnow Vesuvius, as viewed from Pompeii, shows a perfect cone. Fig. 240. Angle of slope of volcanoes, a, extremely steep ash cone (approximately repre-sented in Fusiyama and in submarine volcanoes); b, lava cone (HawaiianIslands). partly surrounded by a mountain wall, which is the remnantof old Somma (Fig. 236). The eruption of lava produces a very much flatter is well illustrated in the Hawaiian Islands, wher
. Elementary physical geography . Fig. — a Japanese volcano. 235). The same is true of Vesuvius, and a part of the oldrim which formed Monte Somma was blown away ; andnow Vesuvius, as viewed from Pompeii, shows a perfect cone. Fig. 240. Angle of slope of volcanoes, a, extremely steep ash cone (approximately repre-sented in Fusiyama and in submarine volcanoes); b, lava cone (HawaiianIslands). partly surrounded by a mountain wall, which is the remnantof old Somma (Fig. 236). The eruption of lava produces a very much flatter is well illustrated in the Hawaiian Islands, where, VOLCANOES, EARTHQUAKES, AND GEYSEBS. 381 although the volcanoes are exceedingly high, the slope isquite moderate, being less than 10° (Fig. 240). This is dueto the fact that lava tends to flow away as water does, andconsequently to broaden the cone as well as to lessen theslope. Many volcanoes are at one time erupting ash andthen lava; and the cone produced is intermediate in formbetween these two extremes. Such are Vesuvius and iEtna,and indeed the majority of the volcanoes in the world. Effects of Volcanic Eruptions.—One of the most importanteffects of eruptions is the addition of rock material to thesurface from undergroun
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