Volcanoes: What They are and what They TeachC. K. Paul, 1881 - 381 Seiten |
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Seite 51
... evidence bearing on the mode of origin of these rocks . Most lavas are capable of being melted by the heat of our furnaces ; but the different kinds of lava vary greatly in the degree of their fusibility . The basic lavas , or those ...
... evidence bearing on the mode of origin of these rocks . Most lavas are capable of being melted by the heat of our furnaces ; but the different kinds of lava vary greatly in the degree of their fusibility . The basic lavas , or those ...
Seite 59
... may have been formed by cooling from a state of fusion , the larger and well - formed crystals in these lavas must have been formed under other and very different conditions . The larger crystals in lavas exhibit evidence of having been.
... may have been formed by cooling from a state of fusion , the larger and well - formed crystals in these lavas must have been formed under other and very different conditions . The larger crystals in lavas exhibit evidence of having been.
Seite 60
... evidence of having been slowly built up in the midst of a glassy mass , containing crystallites and small crystals . We can frequently detect evidence of the interruptions which have occurred in the growth of these crystals in the ...
... evidence of having been slowly built up in the midst of a glassy mass , containing crystallites and small crystals . We can frequently detect evidence of the interruptions which have occurred in the growth of these crystals in the ...
Seite 64
... MOVEMENT OF BUBBLES . 65 evidence of having. FIG . 9. - CAVITY IN CRYSTAL CONTAINING CARBONIC - ACID GAS AT A TEMPERATURE OF 86 ° F. , AND PASSING FROM THE LIQUID TO THE FIG . 10. - MONTE NUOVO ( 440 FT . 64 VOLCANOES .
... MOVEMENT OF BUBBLES . 65 evidence of having. FIG . 9. - CAVITY IN CRYSTAL CONTAINING CARBONIC - ACID GAS AT A TEMPERATURE OF 86 ° F. , AND PASSING FROM THE LIQUID TO THE FIG . 10. - MONTE NUOVO ( 440 FT . 64 VOLCANOES .
Seite 65
... evidence of having been all formed under these con- ditions of enormous pressure . The glassy base or groundmass of lavas , on the other hand , presents all the characters of materials that have cooled from a state of fusion . Most ...
... evidence of having been all formed under these con- ditions of enormous pressure . The glassy base or groundmass of lavas , on the other hand , presents all the characters of materials that have cooled from a state of fusion . Most ...
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Häufige Begriffe und Wortgruppen
active volcanoes andesites appear atmosphere augite Auvergne basaltic basic lavas canic carbonic acid cavities centre character Cheaper Edition chemical Cloth composed composition condition crater crater-rings crystalline crystals Demy 8vo denuding forces depth dykes earth's crust earth's surface enormous eruption Etna exhibit exist fact Fcap feet formation formed fragments Frontispiece gases geological periods geologists glassy globe granitic igneous Illustrations incandescent interior Island lapilli Large post 8vo lava-currents lava-streams line of fissure Lipari liquid mass melaphyres metallic meteorites microliths miles minerals Monte Nuovo ocean origin parasitic cones Poems portions present pressure price 35 produced pumice quantities rhyolites rock-masses scoria-cones scoriæ Second Edition seen sides silica slope Small crown 8vo solid steam Stromboli structure substances subterranean summit take place temperature Third Edition tion trachytic tuffs vapour vast Vesuvius volcanic action volcanic cones volcanic districts volcanic forces volcanic mountains volcanic outbursts volcanic phenomena volcanic vents vols
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