. Elements of geology : a text-book for colleges and for the general reader. Geology. 94 IGNEOUS AGENCIES. time, lava, cinders, ashes, etc., which accumulate immediately about the crater, and continue to increase, by successive layers, with every erup-. Fig. 77.—Section across Hawaii. tion. Ejections of pure lava, particularly if the lava is very fluid, form a cone of broad base and low inclination. This is the case with the Pacific volcanoes. Fig. 77 is a section through Hawaii, showing the slope of the pure lava-cones of Mauna Loa (L), nearly 14,000 feet high, and of Mauna Kea (K). Tufa- con
. Elements of geology : a text-book for colleges and for the general reader. Geology. 94 IGNEOUS AGENCIES. time, lava, cinders, ashes, etc., which accumulate immediately about the crater, and continue to increase, by successive layers, with every erup-. Fig. 77.—Section across Hawaii. tion. Ejections of pure lava, particularly if the lava is very fluid, form a cone of broad base and low inclination. This is the case with the Pacific volcanoes. Fig. 77 is a section through Hawaii, showing the slope of the pure lava-cones of Mauna Loa (L), nearly 14,000 feet high, and of Mauna Kea (K). Tufa- cones and cinder-cones (Fig. 78) take a much higher angle of slope. 2. With every eruption the powerful internal forces fissure the mountain, in lines radiating from the crater. These fissures are filled with liquid lava, which, on hardening, forms radiating dikes, intersecting the layers of ejections, and binding them into a more solid mass. Fig. 79 shows how these dikes, rendered. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
