The Encyclopaedia Britannica: A Dictionary of Arts, Sciences and General Literature, 10. köideThomas Spencer Baynes, William Robertson Smith R.S. Peale, 1890 |
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Page 235
... volcanic regions , as in North Wales , in " neck " -like masses which may mark the position of some of the volcanic orifices of eruption . Propylite is a name given to certain Tertiary volcanic rocks consist- ing of a plagioclase ...
... volcanic regions , as in North Wales , in " neck " -like masses which may mark the position of some of the volcanic orifices of eruption . Propylite is a name given to certain Tertiary volcanic rocks consist- ing of a plagioclase ...
Page 239
... Volcanic Tuf . - This general term may be made to include all the finer kinds of volcanic detritus , ranging on the one hand through coarse gravelly deposits into conglomerates , and on the other into exceedingly compact fine - grained ...
... Volcanic Tuf . - This general term may be made to include all the finer kinds of volcanic detritus , ranging on the one hand through coarse gravelly deposits into conglomerates , and on the other into exceedingly compact fine - grained ...
Page 241
... volcanic action is apt to show itself again and again even at vast intervals " ithin the same regions and over the same sites . § 1. Volcanic Products . The materials erupted from volcanic vents may be classed as ( 1 ) gases and vapours ...
... volcanic action is apt to show itself again and again even at vast intervals " ithin the same regions and over the same sites . § 1. Volcanic Products . The materials erupted from volcanic vents may be classed as ( 1 ) gases and vapours ...
Page 242
... volcanic mud . 2. Lavas . The term lava is applied generally to all the molten rocks which flow out from volcanoes . The behaviour of the lava as it issues and flows down the volcanic cones will be described in the next sub - section ...
... volcanic mud . 2. Lavas . The term lava is applied generally to all the molten rocks which flow out from volcanoes . The behaviour of the lava as it issues and flows down the volcanic cones will be described in the next sub - section ...
Page 245
... volcanic materials . Sections of ancient volcanic necks or pipes sometimes afford an excellent opportunity of observing that these orifices were originally opened by the blowing out of the solid crust and not by the forma- ion of ...
... volcanic materials . Sections of ancient volcanic necks or pipes sometimes afford an excellent opportunity of observing that these orifices were originally opened by the blowing out of the solid crust and not by the forma- ion of ...
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Common terms and phrases
abundant acid ancient angle appear augite axis basalt beds carbonic carbonic acid centre century character chemical coal coast cone consists contains crust crystalline crystals deposit depth distance district earth equator eruption existence feet felspar formations fossils Gaelic Galatia gallic acid galls galvanometer Gaur gelatin gems geological globe gneiss granite heat hornblende igneous igneous rocks important iron islands known lake land latitude lava less lime limestone longitude mass materials meridian metamorphic miles mineral mountain observed obtained occur ocean organic original orthoclase parallel Paris passing period plane portion present pressure produced quartz regions remains rise river rocks Roman round sand sandstone schists Scotland sediment shales side siliceous Silurian sometimes species specific gravity square miles stones strata stream structure substance surface temperature thickness tion town traced trilobites upper vapour vertical volcanic voyage whole