Earth Sculpture; Or, The Origin of Land-forms |
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Page viii
... cones — Geysers - Fissure - eruptions - Volcanic Plateaux - Denudation of Volcanoes , etc. , and resulting features . CHAPTER IX INFLUENCE OF ROCK CHARACTER IN THE DETERMINA- TION OF LAND - FORMS · Joints in Rocks and the part they play ...
... cones — Geysers - Fissure - eruptions - Volcanic Plateaux - Denudation of Volcanoes , etc. , and resulting features . CHAPTER IX INFLUENCE OF ROCK CHARACTER IN THE DETERMINA- TION OF LAND - FORMS · Joints in Rocks and the part they play ...
Page 173
... CONES - GEY- SERS FISSURE - ERUPTIONS VOLCANIC PLATEAUX ATION OF VOLCANOES , ETC. , AND RESULTING FEATURES . -- DENUD . IN preceding pages we have had frequent occasion to refer to igneous rocks . These , as we have seen , may be ...
... CONES - GEY- SERS FISSURE - ERUPTIONS VOLCANIC PLATEAUX ATION OF VOLCANOES , ETC. , AND RESULTING FEATURES . -- DENUD . IN preceding pages we have had frequent occasion to refer to igneous rocks . These , as we have seen , may be ...
Page 180
... cone , built up usually of successive lava - flows and sheets of loose ejecta . At the summit is the central cup , or ... cones , it is true , are braced and strengthened by dikes and other protrusions of molten rock , which consolidate ...
... cone , built up usually of successive lava - flows and sheets of loose ejecta . At the summit is the central cup , or ... cones , it is true , are braced and strengthened by dikes and other protrusions of molten rock , which consolidate ...
Page 181
... cones consist of cinders , or other fragmental ejecta , with which no lava may be associated . Not infre- quently , again , such cones have given vent to one or more lava - flows . From small cinder - cones , show- ing a single coulée ...
... cones consist of cinders , or other fragmental ejecta , with which no lava may be associated . Not infre- quently , again , such cones have given vent to one or more lava - flows . From small cinder - cones , show- ing a single coulée ...
Page 182
... cones and tuff - cones vary in form according to the character of their con- stituent materials . When coarse slags and scoriæ or pumice predominate , the sides of the cone may have an inclination of 35 ° , or even of 40 ° . When the ...
... cones and tuff - cones vary in form according to the character of their con- stituent materials . When coarse slags and scoriæ or pumice predominate , the sides of the cone may have an inclination of 35 ° , or even of 40 ° . When the ...
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Common terms and phrases
accumulation Alps anticlines basalt base-level basins become beds Carboniferous character cliffs coast-lines cones configuration Cretaceous crust crustal movements crystalline débris denudation deposits depressions depth detritus direction dislocations drainage elevation epigene action epigene agents eroded escarpments eventually feet fiords flexures flow fluvio-glacial deposits folds fracture gently geological structure glacial action glaciers gradually granite ground-moraines Highlands hills hollows horizontal strata ice-sheet igneous rocks inclined indented infrequently irregular islands joints Jura Mountains laccoliths lakes land land-forms land-surface lava less limestone low grounds masses materials Mesozoic modified moraines mountain-chain mountain-valleys mountains normal faults North Old Red Sandstone outcrops owe their origin Permian plain of erosion plateau regions relatively result ridges rock-basins rock-masses sand sandstones schistose schists SECTION sediment shales Silurian slopes Southern Uplands strata streams and rivers superficial surface surface-features synclinal tectonic tend thickness tion tracts traversed underground undulating usually valleys vertical volcanic