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Young Folks' Library, Volume XI (of 20)

Edward Singleton Holden

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Book Excerpt: 
. . .le resistance to their frequent outbreak, and they constantly forced themselves through this crust, pouring out melted materials that subsequently cooled and consolidated on its surface. So constant were these eruptions, and so slight was the resistance they encountered, that some portions of the earlier rock-deposits are perforated with numerous chimneys, narrow tunnels as it were, bored by the liquid masses that poured [pg 48] out through them and greatly modified their first condition.


IDEAL SECTION OF A VOLCANO IN ACTION.

The question at once suggests itself, How was even this thin crust formed? what should cause any solid envelope, however slight and filmy when compared to the whole bulk of the globe, to form upon the surface of such a liquid mass? At this point of the investigation the geologist must appeal to the astronomer; for in this vagu. . . Read More