uch disturbancesmust consequently be far from insignificant,even in the course of a single year. Subterranean disturbances which commencemerely with quakings of the ground often termi-175 Masterpieces of Science nate with the forcible ejection of heated matterfrom the interior of the earth. A rent… … Fig. 50.—Diagrammatic Section of a Volcano molten rock. The solid materials are shot forthinto the air, andfall in showers around the mouthof the orifice; where they form, by their accumu-lation, a cone-shaped mound or hill. Such a hillis called a volcano, or popularly a burningmountain. It must be…
Astronomy · Geology
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