Aldrich, Thomas Bailey, 1836-1907 · Boston, CT : Hall and Locke · leaf 74
n the internal fires were enclosed byan envelope so thin that it opposed but little resist-ance to their frequent outbreak^ and they constantlyforced themselves through this crust, pouring outmelted materials that subsequently cooled and con-solidated on its surface. So constant were… … Ideal Section of a Volcano in Actioit. 48 Wonders of Earth, Sea, and Sky out through them and greatly modified their firstcondition. The question at once suggests itself, How was eventhis thin crust formed ? what should cause any solidenvelope, however slight and filmy when compared tothe whole…
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