Zurcher, 1816-1890, author · London : R. Bentley · leaf 195
14-8 VOLCANOES AND EARTHQUAKES. direction it would meet with fewer obstacles. All that could be detached from the lavas, and carried bj the tides, formed on the same side a commence- ment of alluvium, and in time, the Same causes con- tinuing to produce the same effects, the primitive crater is… … Fig. 4G.— The arand Brule. each eruption the cooled lava has formed round the crater whence it has issued an outer layer which, always rising and receiving new strata, has not been long in forming a mountain. When this mountain had attained a certain height, the crater was of great depth and…
Volcanoes · Earthquakes
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