ملف:The National geographic magazine (1902) (14595295848).jpg

Identifier: nationalgeograp131902nati (find matches)
Title: The National geographic magazine
Year: 1888 (1880s)
Authors: National Geographic Society (U.S.)
Subjects: Geography
Publisher: Washington : National Geographic Society
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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it cra-ter, on the other hand, are more ener-getic than any that can without doubtbe referred to the pseudo-craters. Theminor eruptions from the summit cra-ter, however, may be due to preciselythe same immediate cause as the erup-tions of the pseudo-crater, namely, theaccess of surface water to highh heatedrocks, so that an apparent^ completesequence may be observed between theescape of steam from hot debris and thedischarges from true volcanic conduits.It is thus seen that the discovery of thecrucial test asked for is difficult, andthe final decision, if one is reached,must rest on a judicial balancing of allthe evidence and the weight to be givento the judgment of individual observers.An instructive fact furnished by thepseudo-crater (even when the largerand, as some persons may think, ques-tionable examples are not considered)which has a bearing on the theories ofthe ultimate causes of volcanic erup-tions, is the close similarity, and in factidentity, that exists between the explo-
Text Appearing After Image:
Mont Pelee from Vive, May 27 The great cloud of steam and smoke rose cauliflower shaped from the summit crater to a heightof from two to three miles. The descending shower of rain and ashes shows on the right Drawn by George Varian. Republished from McClures Magazine

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