Earth Sculpture; Or, The Origin of Land-forms |
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Page 24
... feet , but showing no slopes of dé- bris below , as would infallibly be present under tem- perate conditions of climate . In other places , again , are deeply excavated wâdies containing no beds of gravel , 24 EARTH SCULPTURE.
... feet , but showing no slopes of dé- bris below , as would infallibly be present under tem- perate conditions of climate . In other places , again , are deeply excavated wâdies containing no beds of gravel , 24 EARTH SCULPTURE.
Page 26
... feet , or even yards , in thickness . Some granites , for example , are reduced to a kind of gritty clay which may be dug with a spade . Argillaceous and silicious rocks are not so readily affected by the chemical action of rain . Not ...
... feet , or even yards , in thickness . Some granites , for example , are reduced to a kind of gritty clay which may be dug with a spade . Argillaceous and silicious rocks are not so readily affected by the chemical action of rain . Not ...
Page 27
... feet of rock have thus been gradually and silently re- moved from the surface of the land . And the great depth now and again attained by rotted rock testifies likewise to the destructive action of rain - water perco- lating from the ...
... feet of rock have thus been gradually and silently re- moved from the surface of the land . And the great depth now and again attained by rotted rock testifies likewise to the destructive action of rain - water perco- lating from the ...
Page 30
... feet or even yards below the weathered super- ficial portions . It is hard , indeed , to get a specimen of such rock from the bottom of our deepest quar- ries which is perfectly fresh . Water soaks through interstitial fissures and ...
... feet or even yards below the weathered super- ficial portions . It is hard , indeed , to get a specimen of such rock from the bottom of our deepest quar- ries which is perfectly fresh . Water soaks through interstitial fissures and ...
Page 32
... feet of various calcareous rocks have thus been gradually removed ; while in other cases the contour of the ground has been nota- bly affected by the collapse of underground channels and chambers . But if the results of the chemical ...
... feet of various calcareous rocks have thus been gradually removed ; while in other cases the contour of the ground has been nota- bly affected by the collapse of underground channels and chambers . But if the results of the chemical ...
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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