81 Masterpieces of Science jected into the cracks, forming, when cold, hugerocky ribs known as dykes. In other cases, thechimney gets choked up by a plug of hard lava,and new vents may then be opened on the side ofthe cone. Fig. 53 is an ideal section of a volcano,showing the dykes of lava running… … Fig. 53.- - Diagrammatic Section of Volcano, with Dykesand Minor Cones flanks studded with parasitic cones, some ofwhich are of considerable size, one being upwardof nine hundred feet in height. After a volcano- has long been silent and thelarge crater has been more or less filled, partly byejected…
Astronomy · Geology
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