. The first [-fifth] reader of the school and family series. found them ; stranger handsBore them to where yon cottage there, one summer evenings left them to their last repose. Such the brief page thy story fills, Thou lonely cottage of the hills. Een while I gaze, nights gloomy shade Is gathering, as the moonbeams fade. Around thy walk they faintly play— They tremble—gleam—then flit away; They fade—they vanish down the dell: Lone cottage of the hills—farewell!—Anonymous. LESSON XIII.—YOLCAKOES AXD EARTHQUAKES. ^_ . T_ 1. Openings in the crust of the earth, itsually thro
. The first [-fifth] reader of the school and family series. found them ; stranger handsBore them to where yon cottage there, one summer evenings left them to their last repose. Such the brief page thy story fills, Thou lonely cottage of the hills. Een while I gaze, nights gloomy shade Is gathering, as the moonbeams fade. Around thy walk they faintly play— They tremble—gleam—then flit away; They fade—they vanish down the dell: Lone cottage of the hills—farewell!—Anonymous. LESSON XIII.—YOLCAKOES AXD EARTHQUAKES. ^_ . T_ 1. Openings in the crust of the earth, itsually through mountains,from Avhich issue smoke, flame, orgases so iUuminated as to appearlike flame, and streams of meltedrock called lava, are known by thename of volcanic craters. The burn-ing mountains themselves are usu-ally called volcanoes. An earth-quake, or shaking of the earth,is probably produced by fi-actures and sudden hearings and sinkings. IstDlv. OP PUYSICAL GEOGRAPHY. 391 in the elastic crust of the globe, caused by the pressure of theliquid lire, vapor, and gases in its interior. Volcanoes are thechiiuneys of these internal tires, and when they get vent theearthquake always ceases. 2. It appears, from numerous observations, that the inter-nal heat of the earth gradually increases as we descend belowthe surface, so that, at the depth of two hundred miles, thehardest substances must be in a state of fusion ; but whetherour globe is encompassed by a mere stratum of melted lavaat that depth, or its Avhole interior is a ball of liquid fire sev-enty-six hundred miles in diameter, inclosed in a thin coatingof solid matter, men of science are not agreed. 3. Some jDortions of the earth are much more subject tovolcanoes and earthquakes than others. The range of theAndes, from Cape Horn to California, with a cross sectionembracing the Caribbean Sea, and extending westward quiteacross the Pacific Ocean, is one vast district of i
Size: 1744px × 1433px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1860
